ep. and ford claimed that the c-max delivered 47 miles per gallon. consumer reports testing found it was really 37 miles per gallon. that is a difference of ten miles per gallon. epa and ford said the ford fusion hybrid delivered 47 miles per gallon as welcome binded city and highway. consumer reports found it was far less, 39 miles per gallon, a difference of eight. that consumer reports article prompted epa to reevaluate its testing methodologies. they told this is different type of hybrid and we need to understand it. it has long been understood mileage in the new generation of hybrids regardless of make is especially vulnerable to changes in driving habits. epa official told usa today if you drive a hybrid the way you drive a porsche you will get less mileage than the national average. they get much worse mileage in cold weather. battery life decase in cold