My dealer replaced the original "trip calculator" (don't remember GM's fancy name for it. . . shows direction, temp. fuel used, MPG, etc.) and ever since then it over estimates the range for the remaining fuel. Last month it showed a range of 60 mile remaining when I had less than 1/2 gallon of gas left in the tank. My guess is that when they replaced the original unit, they replaced it with a unit that thinks I have a 20 gallon tank, when I actually have a 16.5 gallon tank.
Anybody else had this problem? Any suggestions. . . 'cuz the dealer isn't coming up with any fixes. Oh yeah, '01 Trailblazer
Thanks, Speedo