285/70/17 poor mpg

Once you install a hypertech spedo calibrator you will jump up to high 15’s but your no different then all of us running them.

 

There a 4mph difference at that speed so your readings are accurate

 

Weird. I get 18-19mpg with 285/75/16’s

 

Its all about dat rotating mass.

You're running a 52lb tire (vs 40lb stock) and probably a 28-30lb wheel (vs 22-24lb stock). Rotating mass is the WORST place to add weight in regards to gas mileage, even a few pounds of heavier tire will make a difference. Your mods are the equivalent of strapping TWO gallon jugs to EACH wheel then driving around with them constantly dragging you down. Not to mention wider tire = more traction = more resistance -> worse mpg as well.

All that said 14mpg every now and then isn't even bad, I'm on stock tire size and stock ride height and I've seen tanks dip down to 14mpg, but I've also seen tanks at 21mpg just depends on how I'm driving and how loaded down I am.

 

30.5x9.6 street tire to a 32.7x11.2 offroad tire. Quite a bit heavier and larger, and more rolling resistance. The wheels are likely heavier than OEM as well, more width increases tread contact. On top of that you've added 250-300lbs of accessories and changed the aerodynamics with the lift, canopy and wider tires/wheels.

 

My taco is happiest (for MPG) @ ~60 mph.
That helps a bit.

 

averaging 18 here, 285/70/17 p rated though but wildpeaks aren't the lightest tire....so. ymmv

 

Wait until you add even bigger tires and more armor/weight. This weekend I was trying to cruise at 80 and never got out of the 9’s.

 

I've got 275/70/17 KO2 with method mesh, Kings 2" lift and getting 15 mpg going 75 on the freeways. I'm putting the air dam back on this week to see if that helps any.

 

I'm in the same boat on 34x10.50r17 KO2s that are not the E rated set. I rarely see mid 15s and regularly in the 14 range, I don't go slower than 72-75 much on the interestates where I am because I'll get ran the heck over.

 

That’s not too bad. I was averaging 12-14 loaded and now am back up to 15-17 after regearing.

 

I am also doing the same this week to see if it helps.

 

Try only going 60. I bet that brings it up!

 

What did you expect? Lol i got 22/23 mpg before lift and 285 ko2’s.. after the lift and wheels i got 18mpg.

 

Every time I go any amount oversize on tires on my past Taco's, my mileage suffers a fair amount. I just see that as part of the price of running big tires.

 

I run 265 70 17 Bro2s and get about 18.5 mpg mixxed. I recently put the air dam back on and didnt notice any diff except better steering tracking on highway. For comparison its winter now and when i took the air dam off last it was summer and noticed a few more miles tank (15 or so).

 

Regear to nitro 4.88 gears...problem solved.
http://www.rogue-offroad.com/product-p/gptaco2016-4.88-8.75.htm

 

I expected better than 14!

 

Do you have a ball park of what it usually costs to install the regear?

 

@KTJO 4x4 just had her gears done