2012 F-150 troubles

Asked by May 07, 2017 at 09:21 PM about the 2012 Ford F-150 FX4 SuperCrew 4WD

Question type: General

I just bought a 2012 F-150 from a dealer. It has a 6"
lift and 35" tires. I love the truck but it is giving me a
few headaches.
My gas mileage is reading about 10-11 mpg. I am
assuming this is because they never updated the
computer for the bigger tires. Right? And is there
anything y'all would recommend for getting better
gas mileage in general? Intake, exhaust, etc? (And
no...I'm not going to get rid of the lift)
Also, it seems to hesitate when shifting gears
around 2000 rpms. Is this because they didn't
change the gearing ratio?
Finally, it is having trouble with cold starts. In the
morning and after work it seems to have trouble
cranking. It always cranks on the first try but takes a
few seconds to turn over. If I start it and drive to the
store and then restart it, it always cranks up like
there is no problem. Even if the engine is still cold.
Any thoughts? I have heard it might be a fuel
pressure issue.
Keep in mind I know nothing about cars/trucks so
try to keep the terminology as dumbed down as
you can for me. Thx

9 Answers


If you have the V8 then you are suppose to get 15 city and 21 highway with perfect / ideal test conditions and factory tires and ride height. A lift kit and huge wheels and tires now means you have more wind resistant when a large contact patch on the road (meaning tires). You are now a 5,128 to 6,210 lbs or heavier brick. Sorry there is nothing you can do with the lift and tires to get better gas mileage. You pay a price (at the pump) to have that look. How many miles are on the truck?? It sounds like it is battery / alternator time and / needs plugs, fuel filter, oil change, transmission service and plug wires. While doing that have all the belts and hoses checked for cracks and bulges / leaks. You may also need filters changed and have the main computer flashed and check for software updates at the dealer.


Trucks like cars need regular service either done at the dealer or by a trained and certified ASE mechanic. I

It has 75k. Yea I know the lift reduces gas mileage. But I hear that getting certain aftermarket products can help with improve the mpg. I took the truck in when I first bought it. The battery is brand new and they checked the alternator, starter, and all fluids and belts as well. Not sure about the filters though. I fully intend on getting it regular maintenance so long as I don't get pissed off about all these problems and sell the damn thing


Lift and big tires will kill the fuel mileage. What did you expect?


About your only choice is trying a reprogrammer like a Bully Dog or some other unit, but you need to find one that can do the recalibration for the change in the tire diameter from stock setting, that is a plus if you ever decide to change the size again. As fas as the mileage you won't gain much but it might help with the take off power.

Well apparently bob is either illiterate, a total douche bag, or proabably both. If he had read anything I wrote he would have seen that I am very aware of the effect on gas by a lift kit and tires. But thank you tennis and guru. You were both very helpful.


Your tires are about three inches taller, or more, than factory tires. Your owner's manual should indicate the proper size tire for the vehicle. You can obtain the complete tire size on the vehicle now. There is a program on the net which will calculate the error of the speedo by plugging in the factory recommended tire with the tires on the vehicle. Also, you do not know if the speedo gear on the transfer case was changed by the previous owner, it may still have the factory gear. You can also have someone with factory tires assist. It's fairly accurate. Have the other person get on the highway and set the speed control at 60 mph. You pace the other vehicle from the rear at a safe distance. When you are neither lagging behind or catching up, check your speedo for error since you know the vehicle in front is traveling at 60.


Darroch_Chris, the only douche bag here might be you. Best of luck with your fuel drinking lifted truck. This is as dumbed down as I can make it.


Walmart has a code reader you can buy for about $20.00 plus tax. It has the OB2 connector and will let you plug it in and see what codes pop up. Once you have the error code you can see (online or in the code book sold with it) what the error translate means. This may help solve the cold start problem. I thought about this also. Since your truck is lifted with larger tires you need to make sure the tires are properly balanced and aligned. If they are out of alignment the gas mileage goes way down. The second thing is you want to make sure the rear axle, leaf springs and rear suspension geometry is set correctly so the back end does not "dog track" down the road. Please check the sir pressure too. If tires are not right you will prematurely wear the tires and gas mileage plummets. Dog tracking is where the back appears to be trying to come around unequal to the rest of the truck. The last last thing pertains to your lift itself. It needs to be checked to make sure it is setup correctly. The front to rear needs to be level. If the front is to high it was cause more wind resistance. If the front to low it was steering, drive and perform poorly. This may require time and patience with a specialist that does custom lift kits. After market performance parts will not unfortunately offer any kind of significant fuel improvements.

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