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Yes, tested at 70-71. GPS is slightly under, by like .5 MPH ... sometimes it jumps to match speedo, but stays 1 MPH lower at current tire size settings. Not sure if I need to adjust it down as few mm to match exactly, but probably OK now.

Thanks for the information. Another question, I had read you may need to adjust ABS after tire size is changed (was previous years RAM, 2018 perhaps). In my 2022, I didn't get any faults or lights after changing the tire size in AlfaOBD ... so it seems like everything is fine. Do you happen to...

At this point actual is 2642. But to get the speedo accurate, I had to scale down to 2595 (originally 2462). The reason I'm adjusting is to get the MPG more accurate, which seemed really low at 10.8 MPG. The prefilled sizes for 275/60/20 are roughly 2600+ too. Those all put the speedo 2-3...

I hope someone has experience with AlfaODB, or other application to adjust tire size, and knows what they are doing...because I'm guessing!! I have 2022 RAM 1500 Crew Cab, 5.7L, 2300 miles. Stock were Alenza Dueler 31in tires. I switched out for Wildpeak AT3W 275/60/20, which are 33.1 in. I...

Well...SH!T! I was hoping this was a fixable problem. Appears not, and I just need to suck it up! Cest la vie ... Thanks for the feedback!

Sounds like it based on what you guys are saying. Just less that I would have expected. I figured my speedo and MPG were off due to tires. Dealer said they don't adjust settings. Only way to do this is an aftermarket program? I saw something like that in a Google search the other day.

70-75

Tested highway, 2 hour drive a couple days ago. Creeped up to 13-14 MPG, on cruise control most of time.

Stock were dueler hl alenza, 275/55/20 31.9 in diameter: 38 lbs New tire: Wildpeak AT3 275/65/20 35 in diameter: 66.1 Gears: 3.21 I had a similar 2014 Chevy Silverado, same config, that got closer to 17-19 MPG, which is more so why this is alarming. I find it hard to believe an extra 130LBs...

And, of course, I'm new to this forum ... so be gentle :p

Brand new, I've been driving this for 2200 miles. AVG is about 10.5 MPG. Latest full tank is running at 9.9 MPG. It's all city driving, and I've been paying attention to the gas consumption lately. I'll probably get 240 miles tops out of this tank, and AMPG is 10. This seems really bad...