3.5 EB Real World MPG

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21CaliPlatEB

21CaliPlatEB

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OK - Maybe this is a dumb question on my part, but did you recalibrate the speedometer after switching to the 34's?

As I understand it, the truck is actually counting revolutions and translating that to distance. If it thinks you have 33" tires but you now have 34" tires, it will calculate fewer miles than you've actually driven. Therefore, the truck will display ~3% worse miles/gallon than you are actually getting. The heavier mass of the bigger wheels and the worse aerodynamics from the lift are bigger factors.
Havent done a recalibration yet, but this did cross my mind as a possibility.





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Madman

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Havent done a recalibration yet, but this did cross my mind as a possibility.
Thanks for the quick reply.

I don’t believe that anyone on thisForum has recalibrated as yet. Please keep us posted if and when you do. Thanks!
 

aika1

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Havent done a recalibration yet, but this did cross my mind as a possibility.
For the math, an easy way to do this is find the distance traveled per revolution of your old tires (or rotations of tire per mile), and the same for the new, and calculate the difference as a percentage (ie your new ones travel 1.03 times the distance as your old ones. You can find those numbers online. Multiply that by your odometer reading at fill up. I do that every time for my lifted ‘Runner at fill-up. Good luck!
 

Iluv2fly

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First off let me say that I love my 21 xlt with the 302a package. It has the 3.5 eco and the power is excellent just waiting for 5 star to come out with a 91 tow and adaptive tune to get another 50hp. I am going to install the cvf intercooler out of my 17 today so I hope nothing underneath has changed. My last truck was a 17xl with 3.5 and 10 speed. Both trucks have 6.5 bed, max tow, and 3.55 gears. With my 17 and 5 star 91 tow tune I was averaging 17-18 with 305/55/20 tires and 1.5" leveling kit. I put those tires on the 21 with a 2" leveling kit and I am averaging 15 so its definitely not as well. Of course as it breaks in it will get better but I still would not go back, the 21 is so much more refined.
 

Wvmtneer

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I’m curious to see if the Tremor mileage is any better than leveling with bigger tires after purchase.
 

JimboJames

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First off let me say that I love my 21 xlt with the 302a package. It has the 3.5 eco and the power is excellent just waiting for 5 star to come out with a 91 tow and adaptive tune to get another 50hp. I am going to install the cvf intercooler out of my 17 today so I hope nothing underneath has changed. My last truck was a 17xl with 3.5 and 10 speed. Both trucks have 6.5 bed, max tow, and 3.55 gears. With my 17 and 5 star 91 tow tune I was averaging 17-18 with 305/55/20 tires and 1.5" leveling kit. I put those tires on the 21 with a 2" leveling kit and I am averaging 15 so its definitely not as well. Of course as it breaks in it will get better but I still would not go back, the 21 is so much more refined.
can you explain your last tune more? was it a 4x4 and did you go from 15 to 17-18 after the tune or was your last truck always 17-18mpg
 

Iluv2fly

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can you explain your last tune more? was it a 4x4 and did you go from 15 to 17-18 after the tune or was your last truck always 17-18mpg
Yes the truck was a 4x4. The tune was a 5 star 91 tow tune and it did not seem to affect mileage much at all but the added power and better transmission shift were very worth it. The 10 speed in the 21 shifts so much better than my 17 it's not even a comparison. Stock for stock the 21 definitely runs better also. This 21 is an awesome truck.
 

Hardhat

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I pick up my new truck next week, XLT Screw 4x4, 3.5L. Its getting leveled on 295/60-20 Nittos and they are calibrating the speedo. Ill let you know what my mileage is =.
 

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