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Chevrolet Impala Real World MPG



  • hersbirdhersbird Posts: 323
    I got 21.3 on the last tank all city and the computer and the hand calculated came out with in .2 of each other. During a highway trip tonight at about 70 over 50 miles I averaged 28 according to the computer. If I backed down to 60 the cylinder deactivation would hold speed and it went up to 33 mpg on the computer on a flat steady section. This trip tonight was with new wheels and tires that have thrown off the speedometer by 4-5 mph low. So would that mean I'm actually getting about 5% better then indicated? That means 29.4 average highway.
    This is on a 2007 with the 3.9 with new 235/50/18 tires in place of the factory 16's.
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