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MadisonMPG · 03-08-2010, 11:29 PM

This is a post that I am doing over at the DodgeDakota forum, I will post the results here and there... You guys will probably accept the results a lot better.

__________________________________________________ ________
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.

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Today, I ran the 3 speed tests today. All three went phenomenally.

65mph: A:23.7 B:23.3 Avg: 23.50
75mph: A:19.7 B:19.1 Avg: 19.40
55mph: A:28.6 B:27.5 Avg: 28.05

The 55mph had a little inconstancy because of a guy cutting me off on the B run. I didn't have time to redo it.

Test went as follows: Accelerate up to speed, set cruise at X speed, clear overhead computer, run till exit I was using to turn around one , record MPG (while still on cruise). The road was kind of hilly, but I ran A going west on the road, and B going east. Gasoline was Route 66's 100% gasoline 87 octane. Truck was loaded with 2 people, total weight 385, along with 50 pounds of cargo. Truck bed cover was on, clutch fan was off. Ambient air temperature was 56 degrees. The front tires had 35 PSI of air, filled before the drive.

* I think I have covered everything? Like I have said earlier in this thread, I am NOT saying that the overhead computer is 100% accurate for actual MPG. But, it does show a pretty noticeable difference at speed.

I am going on a 6 hour trip this weekend, I am going to run 65 the whole time and see if I get somewhere near what this test shows.

03-08-2010, 11:29 PM	#1 (permalink)
MadisonMPG Master EcoModder Join Date: Nov 2008 Location: Madison AL Posts: 1,123 The Geo - '93 Geo Metro Team Metro 90 day: 45.16 mpg (US) Thanks: 30 Thanked 40 Times in 37 Posts	Dodge Dakota Testing This is a post that I am doing over at the DodgeDakota forum, I will post the results here and there... You guys will probably accept the results a lot better. __________________________________________________ ________ 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. __________________________________________________ Today, I ran the 3 speed tests today. All three went phenomenally. 65mph: A:23.7 B:23.3 Avg: 23.50 75mph: A:19.7 B:19.1 Avg: 19.40 55mph: A:28.6 B:27.5 Avg: 28.05 The 55mph had a little inconstancy because of a guy cutting me off on the B run. I didn't have time to redo it. Test went as follows: Accelerate up to speed, set cruise at X speed, clear overhead computer, run till exit I was using to turn around one , record MPG (while still on cruise). The road was kind of hilly, but I ran A going west on the road, and B going east. Gasoline was Route 66's 100% gasoline 87 octane. Truck was loaded with 2 people, total weight 385, along with 50 pounds of cargo. Truck bed cover was on, clutch fan was off. Ambient air temperature was 56 degrees. The front tires had 35 PSI of air, filled before the drive. I think I have covered everything? Like I have said earlier in this thread, I am NOT saying that the overhead computer is 100% accurate for actual MPG. But, it does show a pretty noticeable difference at speed. I am going on a 6 hour trip this weekend, I am going to run 65 the whole time and see if I get somewhere near what this test shows.