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  #16  
Old 03-23-2011, 11:12 PM
xDARKGUITARISTx xDARKGUITARISTx is offline
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Default Re: Could new plugs and wires improve gas mileage?

Ok so as it turns out I don't have 31's on my truck. I have actually smaller tires than stock. I lost about 10mm in height but I gained 10mm in width on them. I don't know what that means but from what I can tell, my mileage should be about the same as the stock size anyway.
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  #17  
Old 03-29-2011, 11:02 PM
dirtbagHB dirtbagHB is offline
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Default Re: Could new plugs and wires improve gas mileage?

just match it and collect the ins. we wont tell.

i have no idea whats up with your rig, but i hope you get it figured out at some point here soon
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  #18  
Old 03-29-2011, 11:43 PM
wintermute wintermute is offline
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Default Re: Could new plugs and wires improve gas mileage?

What's your summer mileage like? Winter sucks for fuel economy. Using 4WD sucks even more. I'm averaging 16.4 mpg (I do probably 80% highway at 70-75 mph). Heavy cold weather idling +4x4 for snow dropped me to ~13 mpg for a tank during the worst I had to deal with here. I imagine it's a bit colder, longer in MN
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  #19  
Old 03-30-2011, 03:57 AM
FireRanger FireRanger is offline
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Default Re: Could new plugs and wires improve gas mileage?

Its a truck. Don't expect more than 18mpg on a good day. It's all in driving style and keeping up with normal maintenance. Plugs are normal maintenance items. There is no such thing as an MPG improving spark plug compared to a normal mororcraft or autolite plug.
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  #20  
Old 04-01-2011, 06:56 PM
xDARKGUITARISTx xDARKGUITARISTx is offline
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Default Re: Could new plugs and wires improve gas mileage?

Well just calculated my mileage and I'm getting about 13.5 mpg. This is just ridiculous. Hopefully it'll get better as the temperatures warm up.
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  #21  
Old 04-04-2011, 03:28 PM
Pickupman04 Pickupman04 is offline
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Default Re: Could new plugs and wires improve gas mileage?

Quote:
Originally Posted by xDARKGUITARISTx View Post
Well just calculated my mileage and I'm getting about 13.5 mpg. This is just ridiculous. Hopefully it'll get better as the temperatures warm up.
That still kinda sucks. whats the ambient temperature there? My 4x4 with 4.10's squeaks by with 14.4-16 mpg on average.. Best ive ever seen was 17.7 mpg.

But to answer your original question plugs and wires may help. That and check your fuel fliter and fuel rail pressure..
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  #22  
Old 04-04-2011, 03:41 PM
matt224 matt224 is offline
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Default Re: Could new plugs and wires improve gas mileage?

70-75 is too fast for a truck. Doing 55 mph will use up to 15% less fuel than at 65, and that percentage will increase the faster you go. I keep mine on cruise control at 57ish and got 16.8mpg with 4.10 gears and 33" A/T tires.
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  #23  
Old 04-10-2011, 11:00 AM
OscarMike OscarMike is offline
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Default Re: Could new plugs and wires improve gas mileage?

Quote:
Originally Posted by matt224 View Post
70-75 is too fast for a truck. Doing 55 mph will use up to 15% less fuel than at 65, and that percentage will increase the faster you go. I keep mine on cruise control at 57ish and got 16.8mpg with 4.10 gears and 33" A/T tires.
Wrong. I get a solid 19-21 mpg @ 80mph on the interstate, where I only get 16-18 doing 55-60 on the highway.
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  #24  
Old 04-10-2011, 11:04 AM
AlxGry AlxGry is offline
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Default Re: Could new plugs and wires improve gas mileage?

i consistently get 14-15.5 out of my truck and thats a good amount of highway and some town driving. Idk what it is with 33's yet.

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Quote:
Originally Posted by OscarMike View Post
Wrong. I get a solid 19-21 mpg @ 80mph on the interstate, where I only get 16-18 doing 55-60 on the highway.
Not in a 4.0
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  #25  
Old 04-15-2011, 06:11 PM
2003BajaRanger 2003BajaRanger is offline
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Default Re: Could new plugs and wires improve gas mileage?

Quote:
Originally Posted by OscarMike View Post
Wrong. I get a solid 19-21 mpg @ 80mph on the interstate, where I only get 16-18 doing 55-60 on the highway.
I don't mean to cause tension, but unless your truck sits on a perfect torque curve or something, the physics of getting better mileage at a faster speed is incorrect.

Parasitic drag: when the speed is doubled, the force increases by 4 times.
For example, if you drove at 30 mph and held a 2x4 out your window lets say it took 20 lbs of force to keep it out straight. If you increased your speed to 60 mph, you would need 80 lbs of force to keep the board held out straight.

It doesn't make sense, since it takes more power to keep your truck moving at that speed. I'm sure it's driving technique. Even 4 or 6 starts and stops drop your mileage.

Unless of course the centrifugal force on your tires at a higher speed makes them balloon up and less tread touches the ground and thus causes less drag.....(i highly doubt it).


And to answer the original post. I had snow tires on my 2wd jeep grand cherokee 4.0 and the best mileage I could get (I repeatedly drove from Seattle to Spokane and back every weekend for 4 months) was 18.9 mpg. That was checked with 100 miles of mile markers, mileage compensation for slightly bigger tires size 3%. I would drive it like a granny and it just sucked the fuel.

My previous tires were almost bald street tires and I would usually get 23 mpg and sometimes 26. So I went to the tire store and bought the least aggressive tire I could that was the cheapest. It was also slightly smaller than original tires (3.5 % checked by mileage calcs and speedo checkpoints and mile markers for over 200 miles). I put those tires on and got 25.5 mpg average after that on highway.

Another thing is I could barely make it to tacoma from Spokane290 miles, without filling up. With the new less aggressive tires I filled up in North spokane and drove to Quilcene (365 miles) and then drove to work and back almost twice (100 mile or so) before having to fill back up.

There are always tradeoffs in this world, aggressive tire, less mileage. If you want better mileage on an aggressive tire, spend alot more.

sorry for long post. Ill get off my soapbox...
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  #26  
Old 04-15-2011, 07:25 PM
imubiquity imubiquity is offline
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Default Re: Could new plugs and wires improve gas mileage?

The one thing that you did not mention is the super chip. You can go to JC Whitney or Jegs and get one for about $250. It seems like allot of money but it improved my fuel by about 5 mpg. Another item that really helped my mileage is that I changed my tires. Less drag and better grip. Thirdly I have a flat cover on the back box of my truck. I also raised the suspension because I do not do much hauling with my truck. I get about 27 mpg and I have 4.0 V6. It is true what they say. Less braking. slow starts and drive under the speed limit and you can save fuel like crazy. Don't forget to use overdrive to help you save on fuel.This is all that I have learned since owning my truck. I wanted a larger truck for towing but now that fuel prices are so high, I would rather sell the 24' V nose trailer and pocket the cash. I am a northern girl, born in Wisconsin, and lived 22 years in St.Cloud, Minnesota. Now I live in WV. Lots of mountains but still get great fuel economy. I also have the K & N air filter. Keep it clean, it helps. A little bit of fuel injector cleaner every 2000 miles does not hurt at all. If you really get frustrated, try the purple oil to replace what you currently use. It is expensive but really helps your engine work efficiently. I use synthetic oil as a rule.

Last edited by imubiquity; 04-16-2011 at 07:18 PM.
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  #27  
Old 04-15-2011, 09:36 PM
wintermute wintermute is offline
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Default Re: Could new plugs and wires improve gas mileage?

Looks like I'm just too used to driving my Impala which would cruise along at 75 and still turn in 26-28 mpg. My last trip down to Vancouver I did 75 down and 70 back and managed to pick up 2-3 mpg.

And to stay on topic, that's with a brand new set of Motorcraft plugs and wires, installed 3 days prior. So, in short, NO! New plugs won't change your mileage. How you use your foot will though!
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