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  #1  
Old 03-29-2011, 08:46 AM
2001xlt4d 2001xlt4d is offline
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Default whats my actual milage

truck is a 2001 4.0 2wd with 3.55. stock size was 225/70/15 and now it have 245 75 16. my odo only says 180 to a tank but i know my speedo is off by 5 or so. so can anyone tell me how to calculate my actual millage.
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  #2  
Old 03-29-2011, 08:52 AM
edgeman4.0 edgeman4.0 is offline
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Default

Turbo or bob will probably chime in with the appropriate formula.

God only knows what my accurate mileage is.lol

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  #3  
Old 03-29-2011, 11:13 AM
turbo turbo is offline
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Default Re: whats my actual milage

appropriate formula: (I think!)

you say your speedo is "off by 5 or so", you give no units of measurement. :shrug:

when I lifted my truck (oops. I didn't lift it -- Josh, Dustin, Amanda, Steven, et al did all of the work, and wouldn't let me help!!) and put 31" tires on it, my speedo/odo were off by 10%. If my speedo showed 70mph, I was actually doing 77mph; at lower speeds, it was less noticeable (speedo shows 30mph, actual speed 33mph, etc). anyway, this also meant that my odometer was off by 10%... so, just add that variant into the equation:

a) MPG = (miles driven) / (gallons used).

b) miles driven (actual) = 1.10 * miles recorded (adding +10%)

so, if you're off by 10%, like I was (I fixed that, btw, and you can, too! *[see below])

MPG = ((ending odometer reading - starting odometer reading) * 1.1) / (gallons used)

so, using the partial example you gave, above (it looks like you're using the trip odo instead of keeping track on the regular odo) and assuming how many gallons you filled up with...

MPG = (180 * 1.1) / 15.3

MPG = ( 198 ) / 15.3

MPG = 12.94 mi./gal.

since the trip odo can be (accidentally or purposefully) reset, it's probably a better idea to use the mileage on your regular odo... just keep a notepad in your glove box and write down the odometer reading and gallons purchased each time you fill up.


---

* to fix the problem, see your friendly neighborhood Ford Service Technician. They can reset the 4WABS module for the tire size change to get your odometer/speedometer to read correctly. They can also adjust the PCM for the tire size change so that your automatic transmission shift points are closer to where they should be...
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2001 Ranger XLT 4.0L SOHC
Silver Frost w/ Dark Graphite interior


Modifications
Summit 3" Body Lift
31x10.50 A/T tires
Explorer overhead console
Explorer auto-dim mirror
Explorer auto-headlights
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Door-dinger silencer button
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  #4  
Old 03-29-2011, 11:56 AM
HazardousRanger HazardousRanger is offline
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Default Re: whats my actual milage

just get it calibrated at ford...i heard someonme say they paid 37 bucks to ford to do it
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  #5  
Old 03-29-2011, 01:40 PM
turbo turbo is offline
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Default Re: whats my actual milage

I don't know if you heard me say it, but you might've read (elsewhere on this board) where I did that...

...which is why I mentioned that, too, in the footnote.
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2001 Ranger XLT 4.0L SOHC
Silver Frost w/ Dark Graphite interior


Modifications
Summit 3" Body Lift
31x10.50 A/T tires
Explorer overhead console
Explorer auto-dim mirror
Explorer auto-headlights
Aux1 & Aux2 inputs on factory AM/FM/CD/Cassette
Door-dinger silencer button
Seamless retractable roof and passenger-side ejection seat with steering wheel mounted controls and safety interlock
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  #6  
Old 03-29-2011, 01:42 PM
HazardousRanger HazardousRanger is offline
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Default Re: whats my actual milage

haha, ill be doing that soon after i get my 32s ...i cannot drive w my gauge reading wrong lol i was also going nuts when i couldnt even see it at night due to a blown fuse....i cant imagine how much itll bother me knowing my mph and mpg are off haha
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Ford Ranger Edge Supercab, 2004 3.0 Auto, 2WD, 4.10 Axle 31x10.5x15 BF Goodrich All Terrain T/A KO's


My Truck Is My Mountain Bike's Ride!

Class III hitch, Rhino Bedliner, Almost Maxed T-Bar Crank, Tuff Country Add A Leaf, Custom Low Anchor Points, OEM ('99) Tow Hooks, Pro Comp Offroad Lights , Mustang Dome Light, Clear Corners, Slim Toolbox, Blinker Mod,Cargo Brake Light Mod,Expo Lighted Visors, Ultra Silverstar heads/fogs, Fog/high mod, Reverse/switched lights, Bike Fork Mounts
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  #7  
Old 03-29-2011, 03:48 PM
edgeman4.0 edgeman4.0 is offline
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Default Re: whats my actual milage

Quote:
Originally Posted by turbo View Post
appropriate formula: (I think!)

you say your speedo is "off by 5 or so", you give no units of measurement. :shrug:

when I lifted my truck (oops. I didn't lift it -- Josh, Dustin, Amanda, Steven, et al did all of the work, and wouldn't let me help!!) and put 31" tires on it, my speedo/odo were off by 10%. If my speedo showed 70mph, I was actually doing 77mph; at lower speeds, it was less noticeable (speedo shows 30mph, actual speed 33mph, etc). anyway, this also meant that my odometer was off by 10%... so, just add that variant into the equation:

a) MPG = (miles driven) / (gallons used).

b) miles driven (actual) = 1.10 * miles recorded (adding +10%)

so, if you're off by 10%, like I was (I fixed that, btw, and you can, too! *[see below])

MPG = ((ending odometer reading - starting odometer reading) * 1.1) / (gallons used)

so, using the partial example you gave, above (it looks like you're using the trip odo instead of keeping track on the regular odo) and assuming how many gallons you filled up with...

MPG = (180 * 1.1) / 15.3

MPG = ( 198 ) / 15.3

MPG = 12.94 mi./gal.

since the trip odo can be (accidentally or purposefully) reset, it's probably a better idea to use the mileage on your regular odo... just keep a notepad in your glove box and write down the odometer reading and gallons purchased each time you fill up.


---

* to fix the problem, see your friendly neighborhood Ford Service Technician. They can reset the 4WABS module for the tire size change to get your odometer/speedometer to read correctly. They can also adjust the PCM for the tire size change so that your automatic transmission shift points are closer to where they should be...
SEE, i told you he would chime in. Turbeau iz gotz teh smartz
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2001 Ford Ranger Supercab (4dr), Oxford White, 4.0 Sohc, 4x4, Manual trans (hurst equipped), 4:10's, 3" body lift.
Quote:
Originally Posted by Demon-FX4 View Post
The Edgeman sees his prey and strikes out from the darkness.
Quote:
Originally Posted by Rango88 View Post
Dont f+ck with Ch+ck
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  #8  
Old 03-29-2011, 04:01 PM
FireRanger FireRanger is offline
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Default Re: whats my actual milage

Expanding on that... Your speedo and odo will never be off by X miles or X miles per hour. Changes in tire size will throw it off by a PERCENTAGE, not a fixed number of miles or MPH. So when you do the calculations, you have to do it like Brian said and use the percentage.
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  #9  
Old 03-29-2011, 07:16 PM
turbo turbo is offline
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Default Re: whats my actual milage

...the tricky (not really) part is figuring out the percentage... if your tires/wheels had a smaller circumference than the stock tires/wheels, then you'd multiply the mileage by some factor less than 1 [if, for instance, the circumference was 4% smaller, then you'd multiply the odometer mileage by 0.96 in the formula given, above].

So, how do I figure out what the percentage is, you may ask.

There are a few ways to go about it.

1) measure the diameter of the tire/wheel on both the old set and the new set
. [new diameter] / [old diameter] = odometer multiplier factor

2) measure the circumference of the tire/wheel on both the old set and the new set
. [new circumference] / [old circumference] = odometer multiplier factor
. best way to measure this is to mark the tire where it meets the ground, drive forward until it meets the ground again, and measure the distance travelled.

...obviously, whichever measurement method you choose, the tires should be properly inflated, truck on flat, level ground, etc.

note: people who paid attention in math class will quickly recognize that both measurements are (or should be) identical, since the circumference is equal to the diameter x 3.14 [or any other close approximation of pi]. since we're multiplying by a constant for both operands, the ratio remains the same
__________________
2001 Ranger XLT 4.0L SOHC
Silver Frost w/ Dark Graphite interior


Modifications
Summit 3" Body Lift
31x10.50 A/T tires
Explorer overhead console
Explorer auto-dim mirror
Explorer auto-headlights
Aux1 & Aux2 inputs on factory AM/FM/CD/Cassette
Door-dinger silencer button
Seamless retractable roof and passenger-side ejection seat with steering wheel mounted controls and safety interlock

Last edited by turbo; 03-29-2011 at 07:21 PM.
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  #10  
Old 03-29-2011, 07:17 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: whats my actual milage

Fuck math.
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  #11  
Old 12-03-2011, 05:06 AM
bjurke bjurke is offline
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Default Re: whats my actual milage

this website will do tire size calculations for you. http://www.1010tires.com/tiresizecalculator.asp
your circumference is 10% more and your speedometer is reading 11.1% slower than you are actually going and so your odometer will be off by 11.1% too!
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  #12  
Old 12-03-2011, 05:25 AM
TrainedTiger TrainedTiger is offline
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Default Re: whats my actual milage

Well logically the coefficient to add would be the ratio of the tire size diameter.

if its 30 now and was 25 then it would be 30/25=1.2 x what the odometer reads.
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