Originally Posted by Tra1969
Here is a good one. Keeping up with traffic I ran 75 to 83 steady for 296 miles and only got 29.6 mpg. Figure that one out. Car has 6,600 miles if that matters. Called dealer, not to happy even at the higher speeds, would have expected 37 plus on the mpg. I have a good automotive background, and this one baffles me.
Any idea what the ethanol level of the fuel you are running may be? Ethanol has 40% of the energy level of gasoline so if you happen to be taking on fuel with more than the 10% allowed at the pump it may be a contributor.