Not sure if this will help you or not, but here are a couple of things to consider:
First, doing a levelling kit is going to kill your mileage... the slight rake in the truck's position actually helps a great deal more than we appreciate for aerodynamics. So, that might account for about 1mpg or so.
Second, depending on the grade of tire you put on, you may have added a significant amount of weight to your previous ride. Generally speaking, rolling weight is measured at about 5 times its net weight. What this means is that for new rims, rotors, calipers, brake pads, tires, etc., adding 1 pound is like actually adding 5 lbs. So, if your new tires were an E-rated tire and you have an extra 25 lbs of tire on your rim, you're actually adding an extra 125 lbs. Multiply that by 4 = 500 lbs effective weight.
Now, take that extra weight along with the levelling, and you're driving a much heavier truck with less aerodynamics... that is sure to kill off a good percentage of your mileage since you'll need a whole lot more energy to combat that (especially at higher speeds).
I hope that helps explain it a bit. You may want to consider getting a lighter tire or rims the next go around to help offset the increase in tire diameter. Wish there was a magic pill to make this better, but at least understanding how some of this is occurring may help your frustration... good luck!
Dude...Hypertech speedo recalibrator!
That and keep it shifting under 2000 rpm. (tie a string from your right big toe to your twig and berries if that'll help you ease into the throttle)
I've got the same tires with a similar lift on my 5.7 DC and I still get 16 to 17 mpg on the highway in the summer.
Subscribing. I'm in the same boat. I have a Toytec 3/1 on my 08 DC and get 16-17.5 on the highway. I drive like an old woman, right lane cruising at 65mph....
When the need for new tires comes I would like to go a little bigger. I was going to get 275/70's but have been looking at 285/75 & 305/65's more seriously however, I don't want to seriously degrade my gas mileage. If all it takes to rectify the tire size is the Hypertech then that's OK...
I average 13.9 with my lift and heavy wheels and tires. That is mostly city driving. I don't drive like an old man, but I don't drive like a teenager either.
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2007 Crewmax 4x4 Limited - Silver
2.5" OME Front Lift w/Toytec 1" Diff Drop
1" Toytec Block rear w/Bilstein 5100 shocks
20" Ultra Mammoth Wheels
305/55/R20 Toyo Open Country A/T
Line-X Bed Liner
Undercover Tonneau
Console Vault
Two car seats and a box full of princess toys!
CBTMA Member
Negative on switching to the Tacoma... My buddy has an 08 and I tossed the idea around before buying the Tundra but ultimately went with the full size and am so glad I did...
WildBill, are you using a speedo recalibrator such as the Hypertech unit...? Is it really necessary...?
I drive mostly city and idle alot while working... I haul assss constantly just cuz I like the get up and go....
With my setup, im getting between 12.5-12.9 day to day (thanks E6S, ive been putting that off for a year and just guessing).... Long trips I get in the 16s... 10.8 is about what I get when Im hauling my boat... something doesnt sound right man...
Or you could be like me and trade in the Tundra for a Tacoma and enjoy 22mpg at 75mph on the highway
I routinely get over 20 mpg hwy in a full sized, 5500 lb truck (GM CrewCab Z71 5.3 4wd)... in the hills of TN. I bet the new Tundra 4.6 will do similar...
Re: OK, now I really need advice on MPG!
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