PLEASE FOLKS:
look at this
and this
this topic is so beaten to death here and to drag it back out again and say the same things is the height of laziness. Is there any info on here that wasn't said before that this person could not have read? (rhetorical question)
we beg you folks to search first before you post and read for a reason.
to make better use of the forum space and discussion topics.
PLEASE. I EMPLORE THE NEW MEMBERS TO USE THE COMMoN TOPICS AND SEARCH FIRST.
example: 7 page thread that covered checking fuel filter, lines, plugs, wires, etc
it's the same old skipping CD....
Quote: MichaelDelaney on Nov/25/05
there are several gas mileage threads here.
it's not one thing that results in poor mileage. there are several causes.
we talked about them in the old threads.
the biggest ones that beginners don't understand is the difference between part throttle performance and full throttle performance.
ECU or chip programs work in 2 modes: closed loop and open loop.
closed loop is mostly for part throttle performance and relies on the front (ahead of the cat) O2 sensor feedback to correct the tuning for the car. This is what mostly affects gas mileage from a programming point of view.
open loop is mostly full throttle performance and does not rely on the front O2 sensor to guide the chip. It relies on fixed commands from programs in 2 maps. It does not affect your gas mileage as much when you daily drive because you don't spend a lot of time with the foot planted to the floor. 95% of your daily driving is part throttle tuning and performance and closed loop.
simple maintenance things like cleaning you air filter, checking your tire pressure (using the high end of the recommended range to get more mileage because the tire contact patch becomes smaller and has less rolling resistance to the road and remembering air contracts when it's cold and expands when it's hot), using the right plug heat range and gap, adding fuel injector cleaner once a year, doing the oil change at recommended intervals.....
these all improve mileage...
there's more...
look at the old gas mileage threads in the search....