rough day!
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Fleet Owner
Joined: Aug 2004
Posts: 20,418
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From: AZ
rough day!
Yesterday I took my PSD to the gym for a workout. I drove from Cheyenne, WY to Santa Fe, NM, 500 miles on I25. I had a 30 mph head wind plus climbing Raton Pass at the border of CO & NM. I was down to 35mph, 3,000 rpm's, EGT's at 1,250, second gear, coolingmist water injection maxed out. My a/c quit, which it has done before on hard pulls. When I topped the hill it started working again. Any thoughts on that? Also, its starting to happen more and that is the cruise will kick out once in awile when its pulling a smaller hill, why I don't know.
Anyway, I used 60 gallons of fuel so that's about 8.3 mpg. Pretty bad but under the conditions what can I expect. I run it at 70 mph when I can because that's the good power band for my truck.
Anyway, I used 60 gallons of fuel so that's about 8.3 mpg. Pretty bad but under the conditions what can I expect. I run it at 70 mph when I can because that's the good power band for my truck.
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
How can pumped vacuum run out? It's only operating the HVAC and the brakes, and with the engine pumping at 3300 RPM, if anything, he'd have more vacuum power than at any other time.
AFAIK, just about all vehicles have a wide-open-throttle (WOT) A/C cut-out. Okay, no "throttle" in our case, but I'm sure the PCM does the same thing.
And 8.3 MPG is still better than most gassers would do on such a run.
AFAIK, just about all vehicles have a wide-open-throttle (WOT) A/C cut-out. Okay, no "throttle" in our case, but I'm sure the PCM does the same thing.
And 8.3 MPG is still better than most gassers would do on such a run.
Hotshot
Joined: Feb 2009
Posts: 10,408
Likes: 75
From: Plankinton, SD
When you're on a hard trip like that Glenn, you're better off NOT figuring out the mileage. 
Been there, done that. It's just depressing. I've been down to 6 mpg with my smaller old trailer before I did all my mods, now I haven't gotten less than 9 with the bigger trailer and a modded truck, but also haven't pulled down that hard like you are. I haven't been in that big of hills/mountains up here in the plains. My bad mileage was in a 50mph side wind with smaller hills.
Been there, done that. It's just depressing. I've been down to 6 mpg with my smaller old trailer before I did all my mods, now I haven't gotten less than 9 with the bigger trailer and a modded truck, but also haven't pulled down that hard like you are. I haven't been in that big of hills/mountains up here in the plains. My bad mileage was in a 50mph side wind with smaller hills.
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Joined: Aug 2006
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Fleet Owner
Joined: Aug 2004
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From: AZ
I also don't understand the running out of vac Talyn. I think the pulley is squeaking a little though and will probably change it out when I get home after the first of the month.
Mike, You might be onto something about the a/c and CC. Thanks
Madpogue, thanks, I have actually had worse mileage but I was pleased with 8.3mpg. I ran the **** out of it because the weather was going to turn of us. They were forecasting ice, snow and in the 20's. I didn't want my camper pipes to freeze.
Darin, your 100% right about calculating mileage when you run it hard. It can be depressing. Oh well, my wife con plains but I say, what do you expect when your hauling your 'house around'. I also drive 70 mph because that's the sweet spot for the old ride, lol. I pass most RV's on the road, thank goodness for the high speed 16 ply tires and disk brakes, love them. They said 35 mph winds out of the west today for I40 to Flagstaff and I said **** on it, we will stay in Santa Fe another day but tomorrow its supposed to get cold here so we are out of here.
King, I don't understand either.
Rick, 7,800 feet, felt like 11,000 feet, lol.
Mike, You might be onto something about the a/c and CC. Thanks
Madpogue, thanks, I have actually had worse mileage but I was pleased with 8.3mpg. I ran the **** out of it because the weather was going to turn of us. They were forecasting ice, snow and in the 20's. I didn't want my camper pipes to freeze.
Darin, your 100% right about calculating mileage when you run it hard. It can be depressing. Oh well, my wife con plains but I say, what do you expect when your hauling your 'house around'. I also drive 70 mph because that's the sweet spot for the old ride, lol. I pass most RV's on the road, thank goodness for the high speed 16 ply tires and disk brakes, love them. They said 35 mph winds out of the west today for I40 to Flagstaff and I said **** on it, we will stay in Santa Fe another day but tomorrow its supposed to get cold here so we are out of here.
King, I don't understand either.
Rick, 7,800 feet, felt like 11,000 feet, lol.
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