2012 F-150 troubles

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?

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.