Having MPG issues, whats wrong?

Thanks for reading, I bought my 2011 Double Cab TRD (4.0 V6) a couple of weeks ago and started tracking MPG. I should be getting 17 city, 21 why and about 19 combined (from what I've read).

Everything appears to be factory, no lift or aftermarket parts or engine mods. Although the dealership put big BFG tires on the stock 17" rims.

I've been getting about 17 on the highway and 16 combined.

Any ideas why I'm not getting proper mpg? I used an OBD II scanner to check for pending codes (no check engine light currently) and came up with nothing.

Recommendations? Plugs? O2 sensor? I wouldn't think the 'big' tires are bogging me down that much.

 

I get that with Michelins (265/70/16s), so its about normal

 

Sounds right. Depending on the load rating of those BFGs it could very well be a tire related issue, BFG AT/KO is a pretty heavy tire.

 

Ok, thanks. Good to know. I think I'll keep them on there, the look is worth the MPG loss. Still better than my last truck.

 

Definitely the BFGs, I get 14-15 with duratracs and a few other mods.

 

As stated above, most likely the fault of the tires. When I have my offroad tires on, my mpg drops by a noticeable amount. Then it goes back up to not very good when I put the Michelins back on.

 

You did not mention your speed. With a stock vehicle it is almost always the driver. Keep the vehicle under 2100 on the Tack and it will get the MPG it is rated at or better. Also bigger tires will lose some MPG.

 

Those bfgs are heavy is they are the Bfg at/ko. I am pretty sure those would be load range D. With that being said i don't blame i would take the mpg loss over the look.

 

Good point, yeah I made sure the tachometer was 2k or under (1900-ish is the sweet spot) and used cruise control (very flat around here).

 

Yeah they are the beefy All Terrain / Off Road.

 

also what speed are you traveling on the freeway?

If im nice and ride the hills and cruise at 65 +- 5mph depending on up or downhill.... i can get right at 20.5-21mpg

Same stretch of road but at a constant 75.... down to 16.5-17mpg.


Next... your tires, what size are they and whats the load rating. If they are bigger than stock you must compensate for the less rotations per mile, which will slightly reduce your MPG calculations.... also if they are a heavy tire then yup, your mpgs will be killed.

 

What kind of tires do you have? I'll give it a try but Houston is pretty flat so I don't think that will kill my MPG that much. Usually the MPG you lose going uphill you make up for going downhill.

 

Sounds like the right mpg to me.

 

BFG All Terrains are all E Load Range, which are heavy as lead.

 

Wat.

They come in all LT ratings, not just E.
http://m.americastire.com/dtcs/tire...deSelected=95403&dbar=true&r=CEBINT|pc|95403&

 

All "LT" or "light truck" rated BFG KO tires are in load range E for most sizes. They are not available in D, C or P metric, etc, except for possibly a couple sizes. I wanted the BFG AT for my truck, but E load range is heavy as hell, so I'm going the Duratrac route, cause I can get them in a C load, which is less ply's, and lighter.

 

With stock tires I was getting 20 mpg with every tank. I switched out to more aggressive
all weather tires and it dropped to 17 mpg right away. 50,000 miles so far.

 

Then I would say that it is the tires. Mine is stock except for the 3 inch lift and I average over 20 mixed driving. Over 24 HWY with a standard.

 

I was getting 400mls in the summer stock truck...now lifted and with duratracs I got 330 before the light came on. You also have to consider that you actually drove more than the mileage shown since your tires are now larger.

But yes, mpg will go down with heavier tires

 

I have P265/75R16 Hankook Dynapro ATM RF10's

They weigh in at 39.12 lbs per tire, which is only about 1.8lbs more per tire than the stock P265/70R16 BFG rugged trails.



the BFG K02 is ONLY available in load range E.... if you were to get a 265/75R16 thats 53lbs per tire... THAT WOULD KILL MPG.