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Old 10-03-2013, 12:40 PM   #51
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I think the a/c uses about 7.5 hp so yes it would make some difference with any vehicle.
even at 7.5 hp that is but a mere .017% of my 435RWHP(closer to 500@engine).A numerical drag for sure but in the grand scheme a totally insignificant portion of diesel usage.....

I used to really fret when I had a bad day of pulling the trailer and only avg 10mpg....

anymore I don't care...I leave it running with ac and rear tv on for my daughter at all stops..its just a few bucks and we are supposed to be relaxing and enjoying yhis whole camping thing...lol
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Old 10-21-2013, 09:10 PM   #52
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Speed makes a big a differance in gas milage. I just made 400 mile trip to the twin cities. The first 250 miles I drove 62 mph and got 20.5 mpg. The next 150 miles I drove 77mph. That's when I found the milage dropped down to 17.5 mpg with the cruise control both times. So 3mpg adds up in the pocket book.
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Old 10-21-2013, 09:20 PM   #53
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Originally Posted by ironj View Post
even at 7.5 hp that is but a mere .017% of my 435RWHP(closer to 500@engine).A numerical drag for sure but in the grand scheme a totally insignificant portion of diesel usage..... I used to really fret when I had a bad day of pulling the trailer and only avg 10mpg.... anymore I don't care...I leave it running with ac and rear tv on for my daughter at all stops..its just a few bucks and we are supposed to be relaxing and enjoying yhis whole camping thing...lol
Check your math. From a practical perspective, agree that it won't make much if a difference, and your comfort is more important.
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Old 10-21-2013, 09:39 PM   #54
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i have to chuckle a bit. we buy these (sometimes) huge by large rolling palaces, homes on wheels whether they be towed or driven, and worry over fuel mileage. it is sometimes kinda oxymoronic.
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Old 10-21-2013, 10:02 PM   #55
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Check your math. From a practical perspective, agree that it won't make much if a difference, and your comfort is more important.
math was right..decimal in.. wrong place...lol..a technicality...

on another note made a trip to caprock canyon st park...ran into cold front just as I left...26mph headwind....got 6.2mpg avg going up....did have the 35" nittos on and not my normal stock tires I use for towing. ..ouch..!! had a good laugh with my camp neighbors (who work with my wife at hospital) as they netted the same or worse in their diesel pushers......I hate you wind. .!! lol
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Old 10-22-2013, 09:08 AM   #56
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Headwinds are the worse. I had a DP and just moved to a 5th wheel. the DP pretty much averaged 9 weather a towed something behind it or not. But get into a head wind and I could drop down to 7. And thats on the east coast where steep long grades are limited.
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Old 10-22-2013, 10:23 AM   #57
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even at 7.5 hp that is but a mere .017% of my 435RWHP(closer to 500@engine).A numerical drag for sure but in the grand scheme a totally insignificant portion of diesel usage.....
nice, I guess my 540.44HP rear wheel is around .013hp to run mine, as i said cant tell it is even on
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Old 10-22-2013, 11:17 AM   #58
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nice, I guess my 540.44HP rear wheel is around .013hp to run mine, as i said cant tell it is even on
actually I mis typed mine..its 1.75%....lol...in any case no...I never know its on.... nice numbers btw. ..gotta love that tq #...can't wait till I get the new 450tow pig so I can delete my 250 and run a better tune and fuel mgmt......for now its all stock save for cold air and stock tune...honestly its more than enough as is tho....but that never stopped me before...
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