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Old August 28th, 2008, 03:21 PM   #17
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My mom's 07 Grand Cherokee 4.7 gets 12 with E85 and 17 with regular 87. Both are long-term averages, several consecutive fill-ups.

Current engines are not designed to take advantage of E85's high octane rating. The compression ratio is a compromise since you can run regular or E85.

High Octane Does NOT equal performance or economy, just that it helps high-performance engines perform best.
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