Miles per Gallon Data

[jimnance]

Without going into all the details, a fairing will only help if it extends most of the width of the trailer, and the gap between it and the trailer is fairly small. Look at big trucks.



Most of the spoilers I say on pickups are far to small to help with much other than reducing the number of bugs on the nose of the trailer.



BTW, I took my new '07 out for the first time with our 30 ft horse trailer with living quarters. I think it's around 9,000 empty. I pulled a couple of hills (mountains to you folks on the East Coast) and the overhead read 9. 8 when I returned home. Of course, it is a new truck with 1,000 miles on the odometer, and I was running up the hills at 70 MPH locked up in fourth gear. Spinning about 2,900 RPM up the hill was sure to hurt the economy.

 

[VRidgley]

Two graphs for your edification. Right-click on pdf files to rotate to horizontal for easy viewing.



onetank.pdf is single tank fillups.

fivetank&cumulative.pdf is a rolling 5-tank average, and total since purchase.



Truck runs unladen, 70 - 75 mph on I-80 in northern Nevada.

Unit is 6-speed 5. 9 L, 3. 73 axle. Jump in mileage at 25,478 miles due to installation of Gear Vendor.



(Occasional high mpg numbers between 7120 and 14837 due to numerous trips on rural roads @ 45 mph, and were not at all representative of normal driving conditions).

 

[ronman]

... Jump in mileage at 25,478 miles due to installation of Gear Vendor. .

So it looks like your Gear Vendor made a significant difference! I know one could argue that the engine may still be breaking in after 25K kmiles, but, it's pretty clear to me that the GV made a big difference in the numbers as soon as you installed it. Overall I like your trend line!



Can't wait to install my GV in the coming weeks. I've had it for most of this year, but have not had the time to install it.

 

[JDerrick]

The only time my 06 sees anything above 14 MPG is when I change the oil and push the master reset on the over head, and even then it only goes up to around 18 ... ... ... ... ... ... ..... ( 1500 - 2000 pounds cargo with topper all the time ) Over all I am happy with the truck, but the so called " economy " that these new trucks were supposed to have over the older ones is CRAP. My 99' 4x4 CTD quad cab , long box, auto regularly received ratings of 18 - 23 on the highway with an average of 1000 - 2000 pounds cargo in the truck at speeds of 65 - 75 MPH. I was never nice to that truck , it earned every inch of 149K at trade in!!!!! If it wasnt for the nice new cushy cab of the 06, I may have been better off keeping the 99 re-building the front suspension and steering and putting a reliable pump on it, and calling it done... ... ... ... ... Idunno . I ran into a guy at the pump the other day that has a friend of his with an 06 auto, LB, 4x4 quad cab, that was having mileage issues also, and has since put 6 injection pumps on the truck before finally finding one that he was able to get any economy out of. Now supposedly( I have not seen this for myself, so this could be another fish story) this guy is turning 18 - 21 ( 75 - 80 mph on the I-80 here in Elko) on the highway with a light load ... ... ... ... ... ... ... ... so is this bull**** or is this the trick with these trucks and has cummins finally sold everyone the " deal of their lives " ???????



sigh... ... ... ... ... ... ... ... ... ... .







Jim Derrick