6.2 Diesel Cruising RPM's - The 1947 - Present Chevrolet & GMC Truck Message Board Network

01-18-2015, 05:01 PM

#11

Edahall

Registered User

Join Date: May 2011

Location: Goliad, TX

Posts: 672

Re: 6.2 Diesel Cruising RPM's

Quote:

Originally Posted by Eraser475

Why does it just drop so quickly? Is it because resistence increases as speed does?

The answer to your question is poor aerodynamics. Remember, these vehicles were produced when the maximum speed limit was 55 mph. The worse the aerodynamics, the faster fuel economy will drop off with speed. It'll also limit top speed.

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1990 ¾ ton 4x4 Chevy Suburban
-Cummins Diesel - 12 valve - factory rebuilt
-6 speed bullet proof manual transmission - NV5600
-Gear Vendors Overdrive - HX35 Holset Turbo
-NP205 iron transfer case
-3.73 gears -2" Lift

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