The chevy colorado 2019 with duramax engine has impressive towing capacity of 7,700 lbs. In urban conditions, you can count on 22 miles per gallon. The Chevy Colorado Somehow Has The Best And Worst Gas Mileage Of All 2021 Small Pickups I got almost 29 mpg on the way back from baton rouge to east of atlanta. Chevy colorado diesel mpg fuelly . #4 · mar 1, 2017. I start of the video with a top off at he gas stat. This engine provides pretty good fuel economy, which goes up to 30 miles per gallon on the highway. Discussion starter · #1 · may 16, 2020. Nevertheless, the 2.8l turbo colorado diesel engine provides 20 miles on a city and 28 miles on a highway per single gallon of fuel. Since i got it, it has averaged 21.7 mpg (display) with the best tank being 23.2 mpg (hand calc). The 2021 colorado diesel gives the same mpg numbers as the gmc canyon diesel but offers 2mpg less than the gladiator ecodiesel in the city but 1 mpg more on the highway. This was at 65mph the w...