Fight all the way through it and you see this guy is getting 13+ MPG from a big rig in regular freight service. He's not driving 40 MPH like some Cummins guys who claim big MPG. This guy has schedules.
And to think some guys in the PSN are happy with 15-16 MPG.
After seeing this I'm not happy about 26+ MPG from a paltry 9,900 lb truck.
Maintain heat in the engine.
Reduce drag at the rear.
Clean up the initial entry into air at the front.
Seems pretty simple. Thoughts?
With a van, I always like studies where it's something square at the back they are improving. Saw a tractor-trailer on the road during the week with a rear treatment, I took a picture while driving...I'll have to post a pic and the name of the product, as it was listed on it.
Ok, so they are also using the lower rolling resistance tires and the RPM's they were running were...lower than 1400RPM's, right? Is that lower than normal for that kind of purpose?
Dave, I think you're running right around 1300RPM's at 70MPH by design.
1320 RPM @ 70 MPH indicated (speedo is correct)
1415 RPM @ 75 MPH
1225 RPM @ 65 MPH
1130 RPM @ 60 MPH
945 RPM @ 50 MPH (practical minimum although I can coax it lower in the right conditions.
All by design.
1320 is right on the ragged edge of lugging but if I speed up or slow down the "lug" feeling does away. On flat ground EGT is 500-600. Boost is only barely off the peg.
At 75 MPH (through TX and OK lately) the EGT was about 650 and it was making about 3 psi boost.
well i could care less what people that i meet on the road think, although i wont be traveling slow enough to cause a problem. however this weekend i went from st.louis to pulaski TN and back. going down with the cruise on 70-71 i got a hand figured 17.6 mpg out of a stock 2011 6.7 crew cab long bed with 4x4 and 3:73 gears. coming back i went up to 73-75 depending on traffic and the area, that litte difference in speed cost me 1.8 mpg. so if mpg is your goal 55-60 is fine. this was a 448 mile trip each way. seems speed plays a big role in mpg.
Watching the weather before long trips pays off. If you have a tail wind instead of a head wind, I've noticed that makes a huge difference as well.
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