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Gas consumption question

 
Old 01-15-2019, 11:21 PM
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good night guys I am new to the theme of trucks and I have a xlt 2012 v8 5.0 4x4 with a lift kit of 6 "and 37x12.50R 18 tires, according to the computer, the truck gives me a performance of 11.9 milles per gallon at all times either in town or on the highway, my question is: is this normal consumption? Yes or no, and if not, how can this gas consumption be due?
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Old 01-16-2019, 12:14 AM
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Originally Posted by Jesse Hernandez View Post
good night guys I am new to the theme of trucks and I have a xlt 2012 v8 5.0 4x4 with a lift kit of 6 "and 37x12.50R 18 tires, according to the computer, the truck gives me a performance of 11.9 milles per gallon at all times either in town or on the highway, my question is: is this normal consumption? Yes or no, and if not, how can this gas consumption be due?
37" tires and 6" lift. Yup you're getting about right. Most stock trucks get around 15mpg.
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Old 01-16-2019, 01:26 AM
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That is better than I'd expect
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Old 01-16-2019, 06:00 AM
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37: tires and who knows what the rearend gear is.
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Old 01-16-2019, 06:01 AM
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Unless you adjusted for the tire size, that's useless mpg info.
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Old 01-16-2019, 12:14 PM
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remember your math from school Pi=3.14. stock tires were 32" and assuming your tires are really 37" that is 5" taller tire. multiply 5x3.14 =15.70 that your speedometer is reading slow by a little under by 16%. if you hand calculate 12 mpg you are really getting closer to 14 mpg.
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Old 01-17-2019, 08:35 AM
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Originally Posted by white08gt View Post
remember your math from school Pi=3.14. stock tires were 32" and assuming your tires are really 37" that is 5" taller tire. multiply 5x3.14 =15.70 that your speedometer is reading slow by a little under by 16%. if you hand calculate 12 mpg you are really getting closer to 14 mpg.
Just simply divide the new tire size by the old to get the %. so 37/32 = 115.6%, so the 37s are 15.6% bigger. Or divide the difference by the original size (5/32 = 0.156).

Struggling a bit with how that math works out, but I think the farther you get from a 32" base, the farther off the numbers will be....For example, say you start with a 27" tire and go to 35", that a 29.6% increase (35/27 = 1.296) but 8*3.14 = 25.12. But if go from a 32" to a 40" tire, that same 8" increase is now 25%.

But regardless, the idea is the same. OP, corrected for the tire size, your 12 MPG reading is actually about 14 MPG. Not bad considering my 2012 ecoboost with only a leveling kit and 33s averages 15.5 MPG (mixed driving, but mostly around town).
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Old 01-17-2019, 06:14 PM
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Originally Posted by jp360cj View Post
But regardless, the idea is the same. OP, corrected for the tire size, your 12 MPG reading is actually about 14 MPG. Not bad considering my 2012 ecoboost with only a leveling kit and 33s averages 15.5 MPG (mixed driving, but mostly around town).
My stock 5.0 currently gets 17.5 combined with heavier highway. I plan to put 22x10s and 33s while leveled and would hope to get 15.5mpg.

If you don't adjust the size with forscan, the reading will be lower than actual mpg?
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Old 01-18-2019, 08:37 AM
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Originally Posted by thor99 View Post
My stock 5.0 currently gets 17.5 combined with heavier highway. I plan to put 22x10s and 33s while leveled and would hope to get 15.5mpg.

If you don't adjust the size with forscan, the reading will be lower than actual mpg?
If your odometer is correct with the stock tires, then yes, by about 3%. This is assuming the odometer is 100% correct with the stock tires. Also, the adjustment doesn't have to be with Forscan, it can also be with a tuner. In fact, sometimes it can't be done with Forscan. From what I remember, it seems like 2012 and older the Forscan adjustment doesn't work, 2013 is hit or miss, and 2014 and newer seems to work.
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