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For comparison, the conventional M37 with a 330HP 3.7-liter V6 is rated at 18 mpg City and 26 mpg Highway, while the M56 that is powered by a 420HP 5.6-liter V8, at 16 mpg City and 25 mpg Highway.
Read more »For comparison, the conventional M37 with a 330HP 3.7-liter V6 is rated at 18 mpg City and 26 mpg Highway, while the M56 that is powered by a 420HP 5.6-liter V8, at 16 mpg City and 25 mpg Highway.
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