I can't seem to figure out the math... - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 02-28-2012, 11:46 PM Thread Starter
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I can't seem to figure out the math...

Okay y'all I am plain dumb I guess. I use an app on my phone that is like the fuely app. I just filled up tonight and the app said I got 14.5mpg. Now I know its not right due to me having larger tires. So I am asking how to calculate it right. Truck came with 265/75-16 tires. Currently has 37/13.50-17 tires. According to a converter it shows that the tire I have now is 59.2% larger. Seems a little large. But If you all could help me please I would be appreciative of it.
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post #2 of 5 Old 02-28-2012, 11:48 PM
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Tire size calculator

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post #3 of 5 Old 02-28-2012, 11:49 PM
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that way you can put in stock then your current tires... i used this one before

2007 F-250 Lariat Crew Cab
SPL LED Lightbar
20" Fuel Rims
35" Nitto MT's
SCT Livewire w/ Tony Wildman Tunes
PMM Full EGR Delete/ Coolant Kit
Hornblasters 540 Kit
LED Lightiing All Around
All kinds of other Goodies!
2005 Lariat Crew- GONE!
2011 Lariat Ultimate Crew- GONE!!!
Back in a 6.0hhhhh and lovin it!
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post #4 of 5 Old 02-29-2012, 01:06 AM
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A 265/75r16 tire should be about 31.5" tall

So 3731.5=1.17 or 17%.

Your new tires are 17% taller than your old tires.
Multiply your mileage by 1.17 and that should be the corrected mileage.

Lee

2000 F250 PSD SCSB 4X4 418k miles straight pipe gauges 2" leveling kit 315/75r16's
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post #5 of 5 Old 02-29-2012, 11:48 AM
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Quote:
Originally Posted by nuthinbutfords View Post
Okay y'all I am plain dumb I guess. I use an app on my phone that is like the fuely app. I just filled up tonight and the app said I got 14.5mpg. Now I know its not right due to me having larger tires. So I am asking how to calculate it right. Truck came with 265/75-16 tires. Currently has 37/13.50-17 tires. According to a converter it shows that the tire I have now is 59.2% larger. Seems a little large. But If you all could help me please I would be appreciative of it.
If you can find someone with an Autoenginuity scan tool, you can set your vehicle to the tire size that you have on the vehicle vs. stock.
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