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RE: [RC] MPG and diesel trucks - Susan & Jerry Milam

What MPG are you getting at the speed you travel with your trailer Truman?

Susan 

-----Original Message-----
From: ridecamp-owner@xxxxxxxxxxxxxxxxx
[mailto:ridecamp-owner@xxxxxxxxxxxxxxxxx] On Behalf Of Truman Prevatt
Sent: Thursday, June 15, 2006 9:20 PM
To: Susan & Jerry Milam
Cc: 'Debbie Lyons'; 'Ridecamp'
Subject: Re: [RC] MPG and diesel trucks

Your mpg hauling will be more determined by you speed as any other factor.
Wind resistance (or drag) is a significant factor in your mileage -
especially pulling a big box behind you. Drag does not go up linearly with
your speed it goes up with the square of your speed. That is the force from
drag that has to be overcome at 60 mph is 4 times the force of drag that has
to be overcome at 30 mph. The power required for an object to overcome the
drag force goes up with the cube of the velocity. That is the power required
to pull a horse trailer at 60 mph is 8 times that required to pull the same
trailer at 30 mph. The fuel used is directly proportional to the power
required to be generated.

A boxy trailer will generate more drag that one with an aerodynamically
efficient nose. Removing your tailgate will reduce your drag.

There is a pretty good discussion at

http://en.wikipedia.org/wiki/Drag_%28physics%29#Drag_at_large_velocity

My truck will pull my trailer down the highway at 80 mph but I sure take a
big hit in mileage. Sixty to maybe 65 seems to be the best compromise for me
- to get decent mileage while not losing my patients on how long it takes to
get somewhere.

Truman


Susan & Jerry Milam wrote:
Getting 14 MPG hauling fully loaded with my 2004 GMC 2500 Duramax. 
Travel steady 58 MPH on highways........
 
Susan


-- 

"The opposite of a correct statement is a false statement. The opposite 
of a profound truth may well be another profound truth."    Niels Bohr 
-- Nobel Laureate, Physics




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Replies
Re: [RC] MPG and diesel trucks, Truman Prevatt