There is a manufacturer by the name of Jet Performance Parts that makes programmers, modules among other items for various vehicles. I just bought one for an '03 Trailblazer with a 4.2 Litre engine in it. Retuning the stock program optimizes power & torque & along with that mileage is improved by 2 to 4 m.p.g. depending on your driving habits. If you have the 4.2 Litre engine you will need the plug in module that comes in a stage 1 or 2, the 2 being somewhat more aggressive changes in the tuning & requires premium fuel, but I think that the extra power & economy that it provides is more than worth the extra .20 cents or so to go from 87 to 93 octane. If you have the V-8 5.3 Litre, then you will need the programmer that plugs into the D.L.C. or data link connector located under the dash just in front of the drivers right leg when seated in the drivers seat. This is much like the plug in module, but with a few more features. They state that this does not void the warranty as it is just optimizing the spark & fuel timing curves for the engine. www.pcmforless.com They will reprogram your PCM for mileage and shift points and make the truck better to drive. The jet module will work for awhile however the learning aspect of the PCM will learn to negate the effects of the jetmodule. This is why the professionals must reprogram the PCM itself to make any long term gains in power and driveability.
The H3 gets the best fuel mileage. Everything but the body is a Chevy Trailblazer.
There is a place place called PCmforless that tunes the computer for better gas mileage. pcmforless.com They have a great reputation with the many enthusiasts from our Trailblazer site that have purchased a "tune" from them. come visit the forum at: www.trailvoy.com
You have to replace the cluster. Then the dealer must reprogram it with the appropriate mileage. You can find vendors on EBay. www.trailvoy.com Trailblazer enthusiasts forum
No one can answer since it's illegal to roll back mileage.
Don't drive as much bum rides from friends car pool and ask for money when you drive
computer. Usually that is. That way one cant just slap another odometer in a try to say that the car has less mileage on it.
in my 02 TB Lt - Ext RWD I get 15.6 combined Like 19 hwy and 14 city
horrible i have a 2005 4wd 4200vortec and i get like 16 mpg hwy,and 12cty
Mileage is controlled by the PCM and your foot. The best method is to have the PCM tuned for mileage. This is accomplished with a tuning program and a lot of experience. The tune is then flashed to the PCM.You can find out more at our enthusiasts forum:www.trailvoy.com
Engine, body, and cluster all store the mileage.
You program the "computer" for a specific mileage between filter changes. It will display a message when it is nearing time for a change. See the owners manual for steps to program the computer module (instrument cluster module0. Carl On the Windstar, the default calculation is on Ford's recommended mileage interval - 5,000 miles. It is possible to over-ride that and set a shorter mileage interval. Those instructions are also in the Owners Manual (See "Related Questions" below)
Join our trailblazer enthusiasts forum at www.trailvoy.com There are a few good options to improve mileage a fair bit. There is a lot of stuff to read and most questions on the forum get answered really fast. You will want to read about K&N intakes and a "TUNED" PCM. The exhaust on these trucks is very free flowing and has only enough restriction to make the VVT work properly.