My Fuel Mileage is AWFUL!

I've got an 08 Tacoma Offroad Access Cab 6-spd with the stock BFG tires on it. I've also installed a URD CAI and run 87 Octane fuel.

I get about 13.2 mpg in the city and no more than 16-17 on the highway. I know the 6-spd is supposed to get 15/19 (city/hwy) per EPA, but generally you see above that. I have a lead foot on ocassion but generally that's not the case. Even if I drive it like a grandma for a tank I don't see anything above what I have listed. Any ideas? I know fuel mileage has been beat into the ground on this MB but I couldn't find anything that fit my situation.

Help!!!!!!!!!!!!!!!!!!

 

Are you calculating it right?

 

Yeah. Last time I filled up I put in 17.4 gallons and had 236 miles on my odo since my last fill up. I'm no math guru but I'm pretty sure I've got it right LOL.

 

im stumped

 

the speedo is off also..
just throwin that out there

 

what size tires are you running?

 

I have your exact numbers but I have 265/75s, exhaust, intake and LT. you should be getting better MPGs. By the way, EPA MPGs are measured at 55 MPH. How fast do you cruise on the highway.

 

do you gas up at the same place? same pump? what's the psi in your tires?

 

lets hear a little more about driving style then(when you shift each gear, down shift, speed on highway/freeway or whatever else). Cuz I get 16 or so in town, and like 18-20 highway quite regularly. Thats lifted on 32's with a bunch of extra weight from add-ons.

 

Did you start getting crappy mileage AFTER you installed the URD CAI? that might be the reason, or maybe you need to start filing up at a different station. They might have a bad batch of fuel?

 

I've always goten bad mileage with it. Cai or no cai. I've tried filling up at a couple different stations to no avail. All top tier stations though.

 

On the highway I typically drive about 70 religiously and don't speed up and slow down. Shifting I typically shift anywhere between 2500-3000 RPM, seems to be the smoothest shift between those RPMs. When I down shift, I typically downshift below my up-shift point, in other worlds when I downshift my RPMs rise to 2000-2500.

I've recently been filling up at the same station all the time and only on 2 of the pumps (one of them is always occupied) and always in the early morning hours.

As for the tires 265/70R16

 

Some other things that I've noticed. I put 93 in it sometime last summer (2008) with the CAI and didn't notice a difference. However on the CAI topic I have noticed that in the winter I get substantially lower GPMs with the CAI on. Last winter I took it off and put the stock intake back on, got better mileage in the winter months (in the warmer months is makes no difference). I might add that I've never tried the stock intake with 93 octane.

 

how miles are on your Tacoma?

 

19,348

Regular oil changes. Tire pressure within specs. etc etc

 

hmmm then my guess maybe wheel bearings are bad? Wouldnt be too far fetched

 

You know, I thought about that too. However for that to be true they'd have to be bad from the day I bought it with 2 miles on it. I may pull the CAI off and throw some 93 at it and see what I get. I'm going on a little road trip this weekend so that will give the ECU time to adjust during the trip. Last time I swapped out the intake for the stock I would get a bank 2 lean out about every 500 miles. Engine wasn't running too hot and there was no performance issue (minus the slight boost that the CAI gave me). So I'm wondering if I don't have an O2 sensor that's bad that the computer isn't picking up.

 

i have almost the same setup but i have 275/70/17 on mine and a trd cai and i get 17mpg no matter what i do city, highway anything

 

Yours a 6 spd?