Quote:
Originally Posted by Old Tele man
...from the 2011 EPA Fuel Economy website:
2011 HHR FFV M5 2.4L/4 22/30 GAS
2011 HHR FFV M5 2.4L/4 16/23 E85
...thats a 17% FE reduction in city-FE and a 13% reduction in highway-FE values.
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That's because the engine cannot change it's compression ratio to take advantage of the higher octane fuel.