Certified Mileage; Rocket sled

[jponder]

Okay I went home this last week running hard. I averaged just a hair under 70 for 500 miles so numerous times I was hitting 80 going down hills. I had my KLR 250 in the back and it catches a little wind. My mileage plummeted to 18. 6. I have gotten 25. 5 at 58 MPH and 26. 5 at 52 mph and I was kinda surprised my mileage dropped that much.

I am never going to drive that fast again; I really dont like it plus I couldnt even hear my Cummins purring with all the wind noise.



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2001 ETH/DEE ST 4X4 SPACE SHUTTLE

 

[Dane]

I've seen the same mileage difference @ 70mph. 60mph seems to be the "sweet spot" as I've seen a 1 mpg difference between 60 and 65 hauling my cabover. Problem is that darn go pedal is soooo much fun @70 #ad
Love to feel the torque of the mighty Cummins when it's chomping at the bit #ad


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2001 HO 6 speed Regular Cab SLT 4x4 3. 54 anti spin 2500. Used for the daily grind and sneaking away to some secret Baja beaches toting a cabover

 

[Big-D]

Makes sense to me. The faster ya go, the more power it takes because of wind resistance. To gain more power requires more fuel. Simple.

 

[Marco]

Hmmmmm, I don't know how to tell you this... .

I do much better than you.
My average MPG on Hwy is arround 11, got down to 8 MPG!
Could it be that I drive a lil' faster than you?!? #ad

Marco.

 

[unclebilly]

Yah and you drive with the E-Brake on and your truck is a gas job...

 

[QRTRHRS]

jponder

Having extra wind resistance really makes a difference. When I pull something on my trailer that sticks up high, I drop down to around 11 but if the profile matches the cab, I get around 13-15. With the flaky Dodge fuel guage, if you are doing some hauling where you have some extra resistance, it is a good idea to err on the safe side. I. e; don't push it on stopping for fuel.

 

[Timinator]

If you have a boost gauge, you can determine how your fuel mileage is going. The higher the boost needle goes, for sustained periods, the worse your fuel mileage.

 

[Marco]

No E brake, running only Diesel... . #ad