hayduke

i was getting 20mpg on stock small tires. switched to 31's last month and now i only get 16mpg.

Kiroshu

31" tirs drop your mileage a good bit considering the stock tires are supose to be 225/75 from the factory toyota specs..... those tires would have you well in the 20mpgs range.... but they look kinda funny... lol. The knock sensor on most toyotas is either you buy the sensor and splice it in. Kinda like some cheap O2 sensors you buy. But if you buy it from toyota it will come with the knock sensor with the wiring harness attached to it.... so yea. Ya know i didn't even think to ask you if one or both of the wheel were locked in the front of the truck. You lift the truck up and see if the wheel spins free from the axle. Um if the brakes are off when the truck is lifed up. You should be able to spin the tire 360 degrees without any issue.

Matt16

Disengaging your hub is most likely not going to net you a noticeable gain in MPG. Stock truck equipped with ADD run around with "locked hubs" 100% of the time.

briholt

Except that it coasts better.

If the front end is supposed to be smooth and not impact mileage with the hubs locked, then if my truck does have a mileage boost after unlocking them, that would point to some drag in either the axle bearings or front differential. Maybe the transfer case, right?

Teuf

I have 33'3, last time i cheked I got about 19.5-20 pre

Cpate81

underbody aerodynamics....aka a skin should increase high velocity mpg by 10-20%

Kiroshu

Put 40 PSI in your tires and do a tank of gas and notice those results. Start looking at your AFM.

briholt

Tires already have 42 psi. AFM is within specs.


I have gotten about 1.4 mpg increase since fixing my manual hub on the passenger side.

briholt

In fixing my passenger hub, I discovered that the previous owner didn't reassemble the hub correctly.

I also noticed that the outer spindle nut (the 54mm one) had some chisel divets. I know that the previous owner had recently regreased the bearings, but I'm wondering if he might have over-tightened the rotor assembly on.

So, if I took the tire off, shouldn't I be able to test the preload, or would I have to disassemble the hub and take the brake caliper off?

24Runna

Good to see your getting somewhere. My mileage dropped from 16 to 13 inexplicably. Still can't find out the culprit.....

Kiroshu

If you can spin that hub around and round with little force and it keeps going a while thats prob not an issue.