1978 GMC C15 MPG
Based on data from 3 vehicles, 44 fuel-ups and 4,300 miles of driving, the 1978 GMC C15 gets a combined Avg MPG of 10.03 with a 0.84 MPG margin of error.
Below you can see a distribution of the fuel-ups with 2 outliers (4.35%) removed.
Following shows the average MPG of each of the 3 vehicles in the system.
1978 GMC C15s For Sale Nearby
1978 GMC C15 Heavy Half 5.0L V8 GAS Automatic 4 Speed Standard Cab Pickup
Added May 2013 • 13 Fuel-ups
Property of citylies
8.4 Avg MPG
1978 Sierra Classic
1978 GMC C15 Sierra Classic 5.7L V8 GAS Automatic 3 Speed Standard Cab Pickup
Added Oct 2017 • 25 Fuel-ups
Property of matthewmark25
10.6 Avg MPG
1978 GMC C15 5.0L V8 GAS Standard 3 Speed Standard Cab Pickup
Added Feb 2015 • 11 Fuel-ups
Property of Cadha13
10.8 Avg MPG