Depending on bore size, 12:1 - 15:1 static for naturally aspirated; 11:1 to 12:1 static for forced induction. Scania has a diesel based E100 motor that has 28:1 compression plus turbocharging.
E85Forum.com :: View topic - Realistic maximum compression ratio for E85?
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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