How many miles to the gallon on an 450 (7.4)GMC suburban?

Asked by May 16, 2018 at 06:44 PM about the 1999 GMC Suburban

Question type: General

2 Answers

139,815

Probably about 12 average.

127,725

Depends on your final drive ratio. I've seen mileage as low as 5 MPG to as high as 18 MPG. The higher the numbers the lower it's geared and the worse the fuel mileage but low end torque is great, the smaller the numbers the better the fuel mileage but the torque is reduced.

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