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  #1  
Old 06-07-2018, 09:17 PM
Branger21 Branger21 is offline
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Default Get better mpg with A/T tires

I just recently installed some bigger A/T tires and wheels and my mpg dropped by over 5 mpg, pumped the tires up to 40 psi still only getting around 16 mpg total.
Wondering if anybody has info on how to squeeze some more gas mileage out of it, without sacrificing too much performance (I know that is a little bit of an oxymoron), willing to replace/upgrade parts.
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  #2  
Old 06-07-2018, 10:32 PM
crowdpleazer crowdpleazer is offline
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Default Re: Get better mpg with A/T tires

change gear ratio or put the correct tires back on.
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  #3  
Old 06-08-2018, 01:38 PM
jeff18 jeff18 is offline
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Default Re: Get better mpg with A/T tires

Drive like a blind granny. That is what I have had to do. Went from 17mpg to 25-28 mpg. 4 banger with manual trans and stock wheels.
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  #4  
Old 06-08-2018, 08:38 PM
Grumpa Grumpa is offline
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Default Re: Get better mpg with A/T tires

With the bigger tires, unless you recalibrate your speedometer, will make you travel faster and farther than what your speedometer and odometer are telling you. To see what I mean, if you have an active gps unit that tells you your current speed, you can compare that to what your gauges are telling you. Your mileage may not be as bad as you think.
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  #5  
Old 06-18-2018, 12:57 PM
rangergambler rangergambler is offline
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Default

Put some stock size firestone destinatio at tires. Less aggreszive AT tire
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  #6  
Old 06-18-2018, 01:08 PM
dvrich dvrich is offline
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Default Re: Get better mpg with A/T tires

Putting larger, heavier, tires on a pickup and then wondering why the fuel economy dropped qualifies you for the "Here's Your Sign" award.
The larger circumference will throw the speedo and odometer off, but not 5 mpg worth.
I have 265/70/17s on my two F150s so I can imagine how much power is being robbed from the small Ranger.
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Last edited by dvrich; 06-18-2018 at 04:27 PM.
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  #7  
Old 06-25-2018, 06:09 PM
crixus crixus is offline
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Default Re: Get better mpg with A/T tires

Speaking of tires, I have Hankook on my Ranger and I'm NOT a fan of that brand. It's almost time to get a new set of tires and I definitely won't buy Hankook again.
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  #8  
Old 06-25-2018, 10:36 PM
Undrstm8ed Undrstm8ed is offline
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Default Re: Get better mpg with A/T tires

Quote:
Originally Posted by Branger21 View Post
I just recently installed some bigger A/T tires and wheels and my mpg dropped by over 5 mpg, pumped the tires up to 40 psi still only getting around 16 mpg total.
Wondering if anybody has info on how to squeeze some more gas mileage out of it, without sacrificing too much performance (I know that is a little bit of an oxymoron), willing to replace/upgrade parts.
I really hate getting involved in these topics because I always sound like an ******* regardless if its true or not. So First off as Dvrich so elegantly pointed out. Anytime you put larger diameter tires on you're going to sacrifice some speed and certainly some MPG.

All is not lost, there are better things you can look into doing which not only help you get some MPG back but as performance upgrades the truck overall is essentially better.

First one is airing up but depending on the tire, you have some built in limitations here. i.g. You're tires may have a max pressure of 45-55 PSI. My 10 ply Hankook DynaPro MT's are thick lugged and heavy ass tires in a 33" trim. If I recall each tire comes in around 60lbs+ not including the rim and max PSI is 80. For the longest time I ran them on the street with 58 in the rears and 54 in the fronts as in turning the tires will heat up some. You may not have that luxury available to you.

On another note, regearing. WELL WORTH it. Gets your MPG back or at least a chunk of it closer and performance levels return. If that's not possible or something you'd be willing to do then going back down to a 25" diameter 14-15 wheel and tire combo should be a goal.

I'd also point out that if you're trying to keep up with every tom, dick, and Sally around town from stop light to stoplight and doing 75-80 on the fwy, you arent going to ever see decent let alone good gas mileage, possibly even if regeared.

Look the original window sticker gave MPG for city and hwy. Simply put vehicle testing in a controlled environment with a top speed of some 22MPH in the city and 55.4MPH on hwy is how they get those ridiculous numbers to begin with. If you arent doing those kinds of speeds to begin with as absurd as they are; no.., MPG = LOL

Im not saying you have to drive those speeds as we know few do but the realization is you're either going to have to be concious of your driving habits and or put some work and money into your truck a little further to get what you want. Only other option is getting a second car to run around town with and the truck becomes the property wheelbarrow or weekend runner with the money you saved from not driving it.

Quote:
Originally Posted by crixus View Post
Speaking of tires, I have Hankook on my Ranger and I'm NOT a fan of that brand. It's almost time to get a new set of tires and I definitely won't buy Hankook again.
Ive gotten well into the 50K on my DynaPro MT's with regular rotations and 6,000 miles.. What dont you like about your tires? They are more known for their performance tires than truck/SUV tires but, they make a good product which of course is susceptible to manufacture defect but Often I feel and find its due to errors on our own part whether its a poor decision on performance reasons or how we treat things, the latter usually being more so the culprit. It is what it is.
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  #9  
Old 06-26-2018, 09:17 PM
hat_man hat_man is offline
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Default Re: Get better mpg with A/T tires

Ok. I'm ready to hear all the groaning and calls of B***S***, but I really don't care.
My old '97 with the 2.3 Lima got a consistent 28-29 mpg running 225/75/15 Firestone Destination A/T's. 5% oversized from stock and IIRC weighed in at about 26-28 pounds each. My daily drive was 120+ miles roundtrip with 40 miles at freeway speed (65-75 mph) 60 miles of two lane blacktop at 55 mph and the rest at in town speeds of 30-40 mph. Dang thing finally gave up with just shy of 300k miles on it.

My new truck (2003 XL 4-cylinder/5 speed) gets even better mpg. Same drive as before but I'm averaging 31.5 mpg. Best tank so far was 422 miles on 12.7 gallons. (33.2 mpg) If you don't believe me, check out my fuel logs here.

http://ecomodder.com/forum/em-fuel-l...ehicleid=10237

The only thing I've done to the truck is oversized tires again. And yes, I did correct for the increased diameter. 235/75/15's are 5% oversized meaning I have to add 5 miles for every 100 miles driven. 60 mph on the speedometer is actually 63 mph driven. No expensive mods, no shutting the engine off, no super slow speeds holding up traffic. I just drive it sensibly and coast in neutral to stop signs and lights.

Like Grumpa said. If you can reflash the computer for the new tire size then do that. If not use a tire size calculator like this one.

https://www.tacomaworld.com/tirecalc

Then do the math. Unlike what Undrstm8ed said, you don't always pay a penalty for larger diameter tires. You will for heavier ones though. A larger diameter tire increases the final drive ratio and lowers rpm's. This helps with fuel mileage. There is a point of diminishing returns though. You can only fit so large a tire in the wheel wells (unless you lift it) and a heavy tire is harder to get rolling and keep rolling. And I don't care how much air you put in a 60 pound tire mounted on a 30 pound rim. It isn't going to help that situation at all. Using that big and heavy off road tire for street driving is dumb. I guess it's the price you pay to look cool. Like the soccer moms we all laugh at driving those huge 4WD SUV's that never even see a gravel road.

The original sticker on my truck gives a mpg rating of 21 city / 26 highway. I'm surpassing that easily. Like I said, check my fuel logs. Almost 8000 miles of driving there. No, mpg does not equal LoL.

I will agree with Undrstm8ed on the re-gearing. It definitely helps. Just don't go too tall (numerically smaller) and take yourself out of the power band. Running at the lowest rpm range for a given speed doesn't always return the best mileage. 3.45 is about as tall as the 2.3 will like. But a 4.0 may be able to handle the 3.08's. It'll be a dog from a dead stop but should do very well on the highway. 3.73 is a good compromise and 4.10 is fine if the majority of your driving is in town. They'll suck on the highway. I'm looking at the 3.45's for my situation. Should be good for another 2 mpg. But I'm set up for mpg, not power or off the line speed.

As for Hankook tires, I'm running the new Kinergy PT's in 235/75/15. Much smoother and lighter than the BF Goodrich All Terrain TA's it came with. The BFG's weighed 36 pounds each and the HK's are 28 pounds. And LRR too. Saw a small mpg increase. About 1.5 mpg. Made in Tennessee not imported. But I don't even have 1000 miles on them yet so the jury is still out.
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Last edited by hat_man; 06-26-2018 at 09:24 PM.
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  #10  
Old 06-27-2018, 07:56 PM
Undrstm8ed Undrstm8ed is offline
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Default Re: Get better mpg with A/T tires

Quote:
Originally Posted by hat_man View Post
Unlike what Undrstm8ed said, you don't always pay a penalty for larger diameter tires. You will for heavier ones though. A larger diameter tire increases the final drive ratio and lowers rpm's. This helps with fuel mileage. There is a point of diminishing returns though. You can only fit so large a tire in the wheel wells (unless you lift it) and a heavy tire is harder to get rolling and keep rolling. And I don't care how much air you put in a 60 pound tire mounted on a 30 pound rim. It isn't going to help that situation at all. Using that big and heavy off road tire for street driving is dumb. I guess it's the price you pay to look cool. Like the soccer moms we all laugh at driving those huge 4WD SUV's that never even see a gravel road.
Just to clarify; I went to a heavier 10ply tire for both function and safety reasons knowing full well the weight penalty. I must retract partially my statement because as you stated, there "isn't always a penalty for larger tires".


http://s150.photobucket.com/user/Und...tml?sort=6&o=7
Originally my 2wd truck had the 3.08 rear end without Limited slip and turning my 25" tires, both the stock 14" w/215/75/14 and the 17" Explorer wheels with low profile 245/45/17 Falken RT615-K's, driving in a behaved manner with the 93' 4.0L manual trans I could get 22.4MPG [best I can honestly say] and that was driving around in hilly areas in mid to upper 90's temps. Very little flat land, and its West coast inland temperatures.. A/C usage? OTHER variables that can and will alter MPG.

Ask anyone with a hybrid vehicle [much easier to notice even subtle changes in] what their E-MPG is driving around in Orange county/lower O.C. vs driving anywhere in Riverside County, Corona, Even San Diego county... Totally different driving spectrums which I dont think you're taking into consideration climate or altitude. And although you slightly mentioned a lifted truck, are taking into consideration lifted trucks at all or stock height and just a plus size tire or two? I'm near 5.75" from stock. Flip-Pac topper on the back (290lbs), I generally used to be inundated with even an additional 370lbs of weight in gear to disappear at a drop of a hats notice to go offroading.


3.08 gears and 33" Heavy lugged M/T's meant for and used extensively for offroading several times a week to be honest day or night for a myriad of reasons.. wasn't for aesthetics or impressing soccer Moms. but MPG suffered to near 14.5 to 17 MPG, YES, due to heavier tires being harder to get rolling and unless traveling long up and down hills say... going to Las Vegas on the 15. Yes, and sometimes also keeping them rolling without dropping a gear, sometimes two was noted.

Enter in; 3.73, 8.8, Limited slip rear same tires, pushing within a couple hundred miles away from 350k on the original engine and trans in my 93' and more than 49k on these tires (DynaPro MT's, rotated every 6k) I can squeeze 20.1 - 19.7 on average utilizing my 54-58 PSI tire settings, less the extra gear weight as of late. I drop tire pressure down to 35 or 32 like everyone religiously swears by and im back down to that 16-17MPG again or worse if I drive like an ass. Airing down is great for the spur roads and trails I hit, Nellis Dunes, etc.. but as you put it "Stupid for the street".

4.56 Gears will be the change over by next spring, and I'll be stopping at 34-35" tires.


More than 3/4 of the year I'm out or on dirt and spur roads, climbing/descending a few low slung rock shelf's, 3/4 of the year. Considering 2.5 year old tires and being in 49k in miles, I see my share of offroad here in the California, Arizona, and Nevada land. Sorry to say but NO Posing or Bro-ho'ing/mall crawling for single moms in this cab.

So lets compare apples with apples and banana's with banana's here..
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Last edited by Undrstm8ed; 06-27-2018 at 08:02 PM.
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