fuel economy

  1. T

    99 GTP issues

    1999 GrandPrix GTP issue. I have a 99 GTP that when cruising at 70 mph rpms are around 3k where as in my 03 rpms are like 2100 rpms. When letting off the gas in the 99 while cruising, rpms will fall to idle, and when gas is reapplied they Rev back up and, idk how else to explain it but, it feel...
  2. 8

    What's your gas mileage?

    What kind of average mileage do you get with your 'Bird? State motor, trans and axle gearing if known.
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