The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Would gas mileage improve going from 4.56 to 4.10 gears 72 K10 with 35s

Greasey Harley · 05-23-2020, 04:37 PM

Maybe, but I wouldn't expect much gain in the mpg department.
It would probably drive better down the highway
4:10 gears would put you around 2755 rpm's@65 mph, as apposed to the 4:56 gears which have you around 3068 rpm's @ 65mph.
If you're getting 13mpg with either one of those combos, you're doing great.

https://www.crawlpedia.com/rpm_gear_calculator.htm

05-23-2020, 04:37 PM	#2
Greasey Harley Registered User Join Date: May 2013 Location: Post Falls, ID Posts: 884	Re: Would gas mileage improve going from 4.56 to 4.10 gears 72 K10 with 35s Maybe, but I wouldn't expect much gain in the mpg department. It would probably drive better down the highway 4:10 gears would put you around 2755 rpm's@65 mph, as apposed to the 4:56 gears which have you around 3068 rpm's @ 65mph. If you're getting 13mpg with either one of those combos, you're doing great. https://www.crawlpedia.com/rpm_gear_calculator.htm