Mileage took a hit with Mich Agilis vs Toyo A31

I got a good deal on some Michelin Agilis 245/75 tires to replace the worn-out stock Toyo A31 tires. I didn't realize these were load range e, weight 40 lb vs 32 lb each, so my mileage has taken about a 2mpg hit. Oh well, my truck looks truckier with em.

 

Welcome to the ride quality of E 10 ply tires.

 

yep that will happen.
You wanna try my 53# General Grabbers?

 

I just replaced my 53 pound Grabbers!

 

I'm planning on replacing my 53# Grabbers with 58# Wildpeak AT4ws.

 

I was thinking today as I hit some of these f’n pot holes how glad I am to have the LT’s. These roads just tear up p metrics.

 

lol well funny you say that because I replaced mine with 57 pound Maxxis MTs.

 

power and MPG's definitely took a hit, but I like em, and don't drive this truck enough to make it worth it (to me) to dump em for something lighter.

 

Yeah overall I think they’re a great tire and they preform really well in all conditions.

 

A lot of P rated tires weigh more than 40 lbs, the ones on my trucks are right around 44 lbs. Most E rated tires start at around 50 lbs. I've had tires that weighed as little as 38 lbs and as heavy as 53 lbs on my Tacoma, all in the same size and with a similar tread. Wider tires and tires with aggressive tread hurt fuel mileage more than weight. My fuel mileage has never varied.

The truck was slower to accelerate with the heavier tires. It takes more power to get them turning. But once up to speed it takes no more fuel to keep them turning than a lighter tire. But if someone does mostly city driving with stop-n-go traffic I could see it making a difference.

Even though you went back to the same size tire your new tires are at least 1" taller than your old ones. That means your speedometer and odometer are reading low compared to the old tires. You're driving faster and farther now. Who knows which is more accurate, but once you correct for the difference in tire size you didn't take as much of a hit as you think.

 

This is some great info. I have run tires of different diameters and tires of the same diameter/width that had different weights. I can confirm that all of that is accurate. Tire size will affect MPG much more than weight. The speedometer thing is a huge difference as well. My speedometer was inaccurate with the stock 245 tires that came on my truck from the factory. The speedometer is 100% accurate with 265/75/16 tires. This is a well documented “issue” with the 3rd gens, if you want to call it an issue. Not that it’s necessarily related to the OP’s issue but it shows that tire sizes changes Speedo accuracy.

 

damn i wouldn't mind a tire in the 50's mine are 67.3# KM3's