A 2014 Chevy Tahoe averages 15 miles per gallon in the city and 21 miles per gallon on the highway. The combined miles per gallon for the Tahoe is 17.
Both the two-wheel drive and four-wheel drive versions of the 2014 Tahoe have the same average miles per gallon. The 2015 Tahoe two-wheel drive model is slated to be slightly more fuel efficient at 23 highway miles per gallon. The four-wheel drive model of the 2015 Tahoe will remain the same at 21 highway miles per gallon. According to the U.S. department of Energy, many factors impact a vehicle's exact fuel efficiency, including driving speed, idling time, aerodynamics and weight.