I will spend a few bucks of my own money to figure out the gas mileage of the 4.7L engine.

Here is the list of test I will do to try to get an answer.
#'s in parenthesis are my guess for MPG boost/reduction.

1. clutch fan on vs off +(0-1.0mpg)
2. 55 vs 65 vs 75 mph (22mpg vs 19mpg vs 18mpg)
3. e10 vs 100% gas (???)
4. 35 PSI vs 44 PSI +(1-2mpg)
5. bed cover on vs off +(0-1mpg)

*I will accept other tests to do from you guys, if I have missed something.

Test truck will be a 2004 Dodge Dakota, 5 speed auto, 2wd.I will maintain 65mph over a 5 mile course. (unless speed is part of the test) And the engine will be fully warmed for each test.

Now here's where it gets tricky, I will be using the overhead computer. This is not 100% accurate, but it will give me the difference in mileage, or at worst, show what helps/hurts.

If you don't like the overhead computers accuracy, i'm sorry, but I trust it for these tests.

 

You should try ethanol free gas also, I'd like to see what that does to your mpg.

 

ethanol free is def better gas station about 10 miles away from me used to have it and with ethanol burns faster. I never checked my mileage when I used it but i could tell i didnt go through a tank as fast.

 

for the mph test....that can vary amongst differential gears. Do you know the ratio of yours?

 

He prolly has 3.55s I wish we had ethanol free gas here but it think its state law or something that they all have to have ethanol in them

 

I have the 3.55s.

 

That would be 100% gas.

 

Using the onboard computer is a joke. That thing can be so far off.

 

yup^^ overhead says 13.4 actual was 10

i mean, how lazy are u, just use the odom.

 

Edit:edit