Powerboost MPG after speedometer correction

[NotMyName]

May I ask how you got your speedomter corrected and what are you rpm’s at 75mph?

Corrected with Forscan by Jesse Infotainment. I’ll snap a picture tomorrow of RPMs @ 75mph

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[fgutz3rd]

Is there a way you can show me exactly how you

 

[NotMyName]

Is there a way you can show me exactly how you

I had someone do it for me using Forscan and have no idea what they did. I know you need an OBD cable to plug into the truck and windows laptop. You should be able to do a search and find more info. Or search for Jesse infotainment and send him a direct message.

 

[fgutz3rd]

Thanks. I tired it and I know mine is jacked up. My truck is going through gas like water and I don’t know why.

 

[HammaMan]

Based on my testing it seems like the trucks w/ 3.73s that go the 34" tire route are immune from impacts as the slight effective gearing reduction is still above that of even 3.55 trucks. So long as aero isn't botched with fender protrusion, it seems reasonable that mileage would be the same if not improve slightly. Aero and rolling drag (going larger than 275 width) can impact this however.

 

[NotMyName]

May I ask how you got your speedomter corrected and what are you rpm’s at 75mph?

 

[fgutz3rd]

That’s the same as me but I’m getting like 16, 17 mpg. I do have a 3 inch lift and LT 290/270r18. I don’t speed. I do not know what to do. I have never hit 20 mpg in that truck. It’s a gas guzzler

 

[NotMyName]

That’s the same as me but I’m getting like 16, 17 mpg. I do have a 3 inch lift and LT 290/270r18. I don’t speed. I do not know what to do. I have never hit 20 mpg in that truck. It’s a gas guzzler

I’m assuming you mean 295/70/18? If so, that’s +6.8% difference between the stock 275/65/18. If you are showing 17mpg, multiply by 6.8% (1.156) = 18.15mpg. The lift and bigger wider heavier tires are killing you. Width probably hurts the most, then weight. Unsprung weight is a killer to power and mpg. Try a lighter tire with max width of 10.8”. Taller is ok as long as width and weight don’t increase drastically. I had a 2004 F150 and went from stock size to an E rated (10ply) tire that was larger wider and much much heavier. Mpg went from 19.5 to 13.5 and the ride was horrible because of the stiffness of E rated tires. Made that mistake once and never again. As far as suspension, I also leveled with pucks. I think that had maybe a .5 loss in MPG at the most. The tires were the killer.

 

[fgutz3rd]

I meant 285/70R18

 

[NotMyName]

I meant 285/70R18

That’s a +5.1% difference. Look up the specs on oem tire weight vs your existing tires.

when choosing my tires, I wanted 1 size larger, same width and not much heavier. 275/65/20 (34.09” x 10.98) 47.53 lbs. Stock was dynapro at2 275/60/20 @ 41 lbs

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