MPGs With 37" Tires For Hybrid 4th Gen Tacoma

Congo · 2026-03-20T02:16:31+00:00

Hello all, I have a 25 Terra TRD Sport hybrid, just started phase 1 of the build and I couldn't be happier. Not a ton of 37 inch information out there, I hope some of this helps you guys. Went from 285/70/18 (34's) on stock sport rims completely stock suspension with zero rub. Did this for about 15k, was averaging about 18-19mpg. Now I have Ironman IM2.5 stage 2 3.5" lift, KMC KM719 17x8 +35, Nitto Recon Grappler 37x11.50 tires. Backwoods Adventure Mods roof rack and sliders, Toyota factory metal skids and trail hunter rear diff skip (being installed this weekend), Dr. KDSS rear track bar bracket. Could not be happier with the IM2.5's initial impression is the upgrade to 2.5" body shocks is drastic, the ride extremely comfortably. I have been told by multiple people that these coil overs specifically break in after about 600 miles so we shall see if that is true, but if they ride even nicer than what it is already I will be ecstatic. I only have 200 miles on the new lift and tires, so far nothing but amazing things to say about the ride quality and overall look of a Tacoma on 37's. Currently getting 14mpg (on the dash/not corrected for size difference). Once I get more time and and many more miles on this current setup I will post more information. But this specific tire and wheel setup has only a little rub at full lock on the front felt, I plan on doing some real flexing and trimming next weekend, I will keep you posted. Please let me know if you have any questions about anything I am running, I will answer to the best of my ability. Shout out to Sunshine State Overland Outfitters for the suspension install and alignment, great, knowledgeable group of guys for anyone in the central FL area.

rustytaco

Administrator

Staff member

Sep 8, 2025

I know fuel efficiency is always a hot topic when it comes to adding weight and things like tires.

I've had my 37s (Arroyo Tires Tamarock RTs) on now for about a month, and done about 3000 miles of combined city and highway driving. For reference, I have a TRD OR Premium Hybrid.

On average, for highway driving going 75+, my MPG was around 12-13. Considering my built 3G on 35s was doing like 9-10, a pretty substantial increase. Obviously there are a lot of factors to consider, like elevation changes, how flat the roads are, wind conditions, etc.

On average, for city driving, my MPG floats around 16-19. Probably averages about 17 or so. Again, on my 3G, the best I ever saw (no regearing) was around 15.

I think a regear could improve these numbers. Add some things like an intake, exhaust, tune - I think 18-20 might be doable, which is pretty impressive.

The 37s account for about a 10% increase in size over stock Off-Road models, and I confirmed this with GPS speed and some simple math. The speedometer shows about 10% less than the correct number. Meaning if I'm going 50 mph, I'm actually going 55.

Included a shot of my average dash MPG, and truck as it sits now.