denret

My 03 has had a decrease in gas mileage of 15% or more lately. I asked the dealer about "flashing the computer", they just blew me off.

Anyone had any experience with this sort of thing??

coolblink

do u have any mods that u did lately

dach95

when that happens, I use fuel system cleaner to help rescue. I don't know if this would help you....worth a try.

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2002 Chevy TrailBlazer 4X4 LTZ EXT Summit White
4.2L I6, 3.73 rear diff ratio K&N HighFlow KN-1009 air filter Airaid Throttle Body Spacer Sylvania Silverstar Lows 9006ST
Infinity Burl Wood molded dash kit In-Channel VentShades 35% front windows.

Excellent source of info http://www.trailvoy.com

Zortster99

Be sure that your air filter is clean. A dirty air filter will kill your MPG. Good luck!

sammydafish

Where do you live? You probably just got some oxiginated fuel or the fuel that you buy not contains more ethanol. Engine's not specificaly tunned to use ethanol bassed fuel will get worse gas miliage on them becasue of the extra oxygen content. (o2 sensor is correcting for the wrong stiocometric value now becasue of fuel change) What brand fuel do you buy? Ask the seller if there is ethanol in the fuel. If there is, you might be able to get you car tunned by a chip or at the dealer to use ethanol bassed fuel. This is popular in the midwest where corn bassed ethanol is plentyfull.