Originally Posted by DunmerBoy
Alright what did you DO to get it there?
Well to start off it wasn't a bunch of crazy modifications I did. I'm just very meticulous about the motor, trans and drivetrain related parts. Important things to think about that can potentially put any debt in your mpg no matter how small of an issue or how close it is to being right. Things like bad u joints or axle shafts or out of round/dented drive shafts. All those things cause added stress to the drivetrain. So I replaced both shafts and front axle shafts. And new U joints. Next I replaced all steering components. And a realignment. (Important to make sure alignment is done to the lift speck and not stock) replaced all ball joints. If the toe-in is off not only does it wear tires quick but it's pretty much havin to push already big tires down the road at an improper angle. This can definitely rob your mpg. Next My gear selection 4.88 is pretty close to stock ratio just lower. Gear selection is very important. You need to try and stay close to stock ratio and take into account tire size obviously. Next exhaust, high flow exhaust. Something less restrictive than stock. I personally went no cats with a flow master dumped before the rear axle. It's important to make sure you have the right back pressure because the o2 sensors rely on that back pressure for the correct feedback. And tires, proper tire inflation. I make sure that all tires have the same and correct psi. Especially if the are under inflated. Instead of rolling down the road smoothly the are actually grabbing the road and it's taking more power (and GAS) to push it down the road. This the reason more aggressive tires like boggers and swampers(than grab the road a lot) can rob mpg. Timing is also very important to check. If it's not firing correctly or even just off a little it's wasting gas. Other little things spark plugs and wires I replaced of them. Make sure no wires are touching. Because they will arch back and forth and cause possibly big but usually small skip or misfire. And then your using gas that's not even getting burned up. It's all theses things that add up. I probably left some stuff out but this explains a little.