I posted awhile back about how I wasnt happy with my fuel mileage. I did some testing and recorded a bunch of numbers. I just was able to get my 325 60 18 Nitto Terra Grapplers installed last week. As soon as they were installed I went to recalibrating the speedo. My fuel mileage has deffinetly went up with just the switch to all terrain tires. Im hoping it will go up some more after I get my intake and boost fooler put on towards the end of the next week. The truck has 23,450 miles.

--33 12.50 18 Nitto Mud Grapplers
-512 Miles
-31.1 Gallons
-65-70 Mph Average
-60 Psi.
-Shifting 1400-1800 Rpm
=
Average 16.463 Mpg Highway

--325 60 18 Nitto Terra Grapplers
-585 Miles
-31.6 Gallons
-65-70 Mph Average
-60 Psi.
-Shifting 1400-1800 Rpm
=
Average 18.512 Mpg Highway!!!!

Gain of 2.049 Mpg Highway!!!

70 mph = 2000 Rpm
75 mph = 2150 Rpm


I'll post some more results as soon as I get the intake and boost fooler installed.

What are some more ways to squeeze some more mileage out of it. Would stacking it with a Xzillaraider get a little more mpg??

 

mine gets 12mpg and i cant fiqure out why. i hope a reflash will help. 2 programmers and still the same.

good numbers i average 380 a tank with 33's

 

My mileage started to improve after15000 miles and took a good pull ,5000 miles with my trailer to loosen it up.At 6000 miles pulling 7000lbs up a 6-7 % grade,hardly break 60 mph,now at 25000 miles pulling 14000lbs, same hill 60-65 plus, amazing.

 

I have seen 12 a few times on some hard tanks. Just running around town the hole tank. Pulling a 32ft Gooseneck Dual Tandem I was averaging 12.3 13.4 on the Highway with the 33 12.50 18 Nitto Mud Grapplers. I havnt had a chance to pull with the new tires yet.