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6.2 fuel milage?

goosedowner

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Dnt Senior Enthusiast

Dnt

Posted
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Tire Size / Transmission gear ratios etc all have to be factored in along with the rear differential ratio.

8L90 has a final drive (8th gear) ratio of .65 where the 6L80 has a final drive (6th gear) ratio of .67

Using an online calculator

2017 6.2 8spd with 285/45R22 32.1 dia tires and 8L90 final drive ratio of .65 to 1 the RPM at 70mph figures out to 1538 engine RPM

2016 6.2 8spd with 275/55R20 31.9 dia tires and 8L90 final drive ratio of .65 to 1 the RPM at 70mph figures out to 1548 engine RPM

2014 5.3 6spd with 275/55R20 31.9 dia tires and 6L80 final drive ratio of .67 to 1 the RPM at 70mph figures out to 1689 engine RPM

So the 2014 was running approx 145 to 150 higher RPM at 70mph cruising speed. Maybe that is why it got less mpg? I would guess that another contributing factor was that the little 5.3 did not have the guts to maintain speed without a lot of downshifting. I have never driven a factory vehicle (to date) that I thought had TOO much power LOL

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2014KL Enthusiast

2014KL

Posted
Posted

I recently traded my 14 double cab 5.3 for a 14 crew cab 6.2. My 5.3 was leveled with 275/60r20. My 6.2 is stock. The 5.3 was definitely better on gas city and highway as advertised. I'd say 1 mpg or more

Porta56 Enthusiast

Porta56

Posted
Posted

So, here is what I have found with real world experience... My 6.2 Denali 4x4 CCSB has 7500 miles on it and an avaerage mpg of 21.8. My Tundra that I traded for it averaged about 17. My work truck is a 2016 F150 with the 5.0 and I am averaging about 19.5 over 11,000 miles. I just drove a rental Dodge with the 5.7 for 4,800 miles and got right at 20 mpg. All trucks 4 wheel drive CCSBs. All mpg's are calculated---not what the display says.

And my 6.2 easily smokes any of the others.

Porta56 Enthusiast

Porta56

Posted
Posted

Forgot to mention that I took off the Goodyear street treads and replaced them with LT 275-65-20 KO2A's. cost me 1 mpg...

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