The subject i am here to talk about is Conservative Tuning at its finest. taking a 100% stock G sedan to a shop with a stock ecu or even a standalone or piggy back system and tuning it to get the best gas mileage possible. has any one tried this? i know that stock my 03 sedan gets like 24 highway but honestly thats not good enough. I was thinking with a tune of some sort i could see that number go as high as 30mpg But is this possible with a stock exhaust intake/intake manifold, headers, and stock ecu? btw last summer "i went on holiday" as Jeremy Clarkson would say Lol haha and i started at Hill AFB, Utah and drove to my fathers house in Junction City, Kansas which 1 way is exactly 1000 miles so i did a experiment i drove there with the traction control on and averaged 24.4 mpg then on the way back i drove the entire way with the traction control off and averaged 25.2mpg i drove the same route but taking into consideration the wind factor of driving acrossed the windiest place on earth KANSAS i wonder if that caused difficulties in this test as well as most of the time i was doing 85-90mph. (it was a boring drive) i can not say for sure if driving with your traction control off improves gas mileage but it could do something with the restriction on the computer idk but if you have more insight i would much like to hear your feed back! As well as on the tuning portion of the matter and getting better gas mileage. And has anybody found a proven way of improving gas mileage i have heard of the magnets on the fuel line and tornado thing in your intake but let me know what you people think! -Matt 2003 G sedan IPW

Uprev osirus has an 'economy' fuel map that runs a little more lean, if you get it tuned you can turn that on However the price of the license and tune would take quite a while to recoup if that's all you are going for. Skip all that junk, air up your tires, make sure all of the maint. stuff like air filters are clear, is the best you can do (and drive like a grandma).

I dont about you guys but I burn more gas in the Fuel econ map than i do in stock. Ive test this a few times commuting back to my college... Is there something up??

Does the fuel econ map really make it run more lean? If so isnt that bad for the car if Im running it on fuel econ most of the time? Which map should I leave it on so it doesnt run lean or rich?

^-- bump for answers

Stock.

The efficiency map is likely 90% stock anyway while your power map may dump a bit more fuel... Depending on your mods I guess.

Why would I leave it on stock?

with all my mods (k&n filter/z-tube, MD 5/16th spacer, MD ART pipes, M2 Performance HR y-pipe, Nismo CBE) the car would be running lean. Thats bad for the motor.. I would think it would be smarter to leave it in the performance one bc it would have a better balance AFR. From the previous post someone stated that the Fuel Econ map would run even more lean?