What is the best way to make improvements to gas milage. Seems like air in and exhaust out. I looked at different air intakes which claim to add 2 miles per gallon and looked at headers and exhaust systems that also make that same claim. Anybody with experience in these areas care to share? Have 2013TT - thanks
The fastest, most effective and least-expensive way to get a measurable increase in fuel economy is to add a real-time display of instantaneous fuel consumption; this will help you (or force you) to modify your driving habits to maximize fuel economy.
Once you have this info in front of you, you will be shocked to see how little throttle opening/load is required to push fuel consumption into the single-digit zone.
The easiest way to get real-time fuel consumption data is to use a little OBD-II bluetooth dongle ($25) plugged into your OBD port under the dash, and any Android device (old cell phone, little tablet, big tablet, etc.) running the Torque Pro app ($5). Aside from instantaneous and long-term fuel consumption, you can display coolant temperature, transmission temperature, air-fuel ratio, battery voltage, timing advance, vehicle speed, exact engine RPM, GPS coordinates, and scores of other useful data.
This will help you determine which gear your should be in vs engine load (climbing a grade, etc.), and also accurately evaluate changes in tire pressure, etc. that can have a measurable effect on fuel consumption.
I started out running Torque on my cell phone, immediately saw what a valuable tool this was, and quickly upgraded to a 7" tablet, and finally to a 10" tablet.
(The photo shows a 7" Samsung tablet sitting against the dash-top gage cluster. It's showing an instantaneous fuel consumption of 255 MPG because the engine is in complete fuel-shutoff mode while coasting to a stop with closed throttle.)