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ksa8907 · 02-13-2019, 03:50 PM

I'd say a diesel swap is not the best approach. If the 3.8 cant hit the mpg numbers you want, you could always put in the 3.1 liter. Also, taller tires will improve the gearing since the 3.8 likely has plenty of torque for it.

02-13-2019, 03:50 PM	#4 (permalink)
ksa8907 Master EcoModder Join Date: May 2012 Location: Tampa, FL Posts: 1,745 Volt, gas only - '12 Chevrolet Volt Premium 90 day: 38.02 mpg (US) Volt, electric only - '12 Chevrolet Volt Premium 90 day: 132.26 mpg (US) Yukon Denali Hybrid - '12 GMC Yukon Denali Hybrid 90 day: 21.48 mpg (US) Thanks: 206 Thanked 420 Times in 302 Posts	I'd say a diesel swap is not the best approach. If the 3.8 cant hit the mpg numbers you want, you could always put in the 3.1 liter. Also, taller tires will improve the gearing since the 3.8 likely has plenty of torque for it. __________________