I've been reading a lot lately about how people have vehicles that have a really good fuel economy. Some even seem considerably better than what the normal car can get. It makes me wonder if there are modifications being done to achieve this. I drive a 2000 GMC Sierra Z-71 5.3L truck. Please do not send any derrogatory messages saying how its a gas hog, etc. This is what my parents got me for graduation 5 years ago. Im curious if there are any driving tips or even relatively inexpensive ($300<) modifications I can make to the truck to improve the fuel economy? I was always told that if you are driving in town with a bunch of stopping and starting to drive in 3rd gear instead of overdrive to save gas. Is this true? Also I have a hypertech power programmer III chip in it right now. Will this increase/decrease the fuel efficiency under the same driving conditions? Just trying to be as conservative as possible to make it through the rough times. Any help is appreciated.