GMC K25 Pickup 4WD Fuel Economy History

MPG by year — EPA official data.

Best MPG Year

1984

18 MPG combined

Latest Model

1988

17 MPG combined

Year	Engine	City	Hwy	Combined	Fuel Cost/yr
1988	Diesel Diesel	15	20	17	$5,000	Details →
1986	Diesel Diesel	15	20	17	$5,000	Details →
1985	Diesel Diesel	15	20	17	$5,000	Details →
1984	Diesel Diesel	16	20	18	$4,700	Details →