Re: OT-powerstroke milage?

Posted by jdemaris on January 13, 2006 at 06:06:00 from (69.67.234.162):

In Reply to: OT-powerstroke milage? posted by Don-Wi on January 12, 2006 at 21:19:18:

If fuel mileage is a concern to you, I suggest you try to make a deal when you find a truck you are interested in - so you can make some sort of initial mileage test on your own. Even if you top off the tank and take it down the highway for 100 miles empty - you will have something to go on. I did that recently with a Cummins-powered Dodge. The guy claimed it got 25 MPG on the highway. I filled the tank twice on two 80 mile runs and it averaged 17.5 MPG. Not exactly a scientific test - but I don't believe the truck was ever getting 25 MPG.
I've kept of database of fuel mileage figures for just about every diesel truck made going back to the late 70s. Problem is much of the information is not verified. With the newer Ford 7.3s and also the newest 6 liter, I've seen the mileage figures vary widely for similarly equipped trucks. I know two people who both have 2000 F250s, ex. cab. 4WD, longbed, standard shift, same axle ratios. One guy claims he gets 23 MPG on the highway, the other says he gets 15 MPG. I see this all the time and don't know what to make of it. Diesels are very reliant on peak RPMs for efficiency - so with some trucks a difference in 55 MPH ot 65 MPH makes a huge difference in fuel-mileage. In my own experience, it has made very little difference with most of my diesels. Perhaps that is because I live in hills and there is very little flat driving in this area. I don't have a Powerstroke - but with my F250 6.9 diesel, it gets just about exactly the same fuel mileage at 70 MPH as it does at 50 MPH - and gets almost the same mileage pulling a 4000-5000 lb. trailer as it does empty. We recently took a long trip across the Michigan UP where it's all flat driving. We drove a couple of hundred miles at 40 MPH and got 14 MPG - the same mileage I get at 65 MPH.

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