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Old 11-14-2008, 03:13 PM
MercedesOtto's Avatar
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Join Date: Dec 2005
Location: Georgia
Posts: 61
Quote:
Originally Posted by curtludwig View Post
I don't think mpg is as related to rpm on a diesel as it is on a car. It takes a set amount of POWER to move the car x distance at y speed based on the rolling resistance of the tires and aeordynamic drag. That power requirement when factored with the efficiency of the engine gives fuel economy.
Increased resistance in any way (dragging brakes, added roof racks, who knows what else) will decrease economy, so will decreasing the efficiency of the engine with things like bad thermostats.
The efficiency on internal combustion engines is highly depended RPM. If to low the efficiency is bad and if to high the efficiency is bad. I commute 35 miles each way and a speed on 75-80 MPG. The engine refs 3000-3500 RPM.

Next week I will try my MPG going no faster than 65...we will see.

Still hoping to find a 2.88 axle ....would a 300SD axle fit?
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