|
Here's a thought that may be worth trying... cool the fuel, heat the air. May keep the timing from getting pulled if there are knock sensors. One of the mods I did to my last gasser ram was to cool the fuel & keep it cool up to the injectors. Overall (all performance mods installed) went from average 12.0 mpg up to 14.5 on the hiway. Mods can work. Cooler fuel gave an extra 12~13% hp/tq in a 1.8t jetta (dyno proven), also did give better mpg based on data I collected on a regular daily commute of 160 mi. Since my home has nothing but diesels, cant try it myself.
Ditch the stock exhaust and get a setup that keeps the OEM diameter without the flat spots. Improve the flow from the airbox to the throttle body (take out any kinks causing turbulance) and keep the low end torque up. Any mod that does not improve torque below 2000 rpm wont help cruising mpg... in my experience. (after doing mods that addressed both go fast performance and being stingy with the fuel when needing it).
edit: forgot to mention that on that Ram I installed a 2.5" dual out cat back exhaust and lost 1.0~1.5 mpg... experimented with a reducer on the output of the muffler which brought the flow to be equal to a single 3.0" output. This brought back the lost mpg for sure but I cannot say (or remember) if it alone helped mpg.
|