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Old 10-01-2013, 04:23 PM   #41
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Hello Oakman,

I see that you drive a Diesel. From what I understand of the AC on, it would have an effect on a gasser, but with a Diesel there is no effect in mpg......
Diesel or gas the compressor uses power, It does effect MPG's. My truck has a slow leak somewhere in the A/C so when its low the compressor will cycle more often, I can feel it kick in and out.

Also, the A/C compressor in some vehicles will cycle with defrosters on, this is also a power/mpg consumer.
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Old 10-02-2013, 09:42 AM   #42
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Get a ScanGauge, use the cruise control. After a while the ScanGauge will probably reveal a sweet spot in the 60-65 range (mine is about 63 MPH).

Cruise maintains tighter speed control than the average Mark I foot/brain speed controller can perform. However, its hard to beat Mark I when you are traveling in the mountains or on rapidly changing grades.
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Old 10-02-2013, 09:42 AM   #43
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Originally Posted by RV PDI Guy View Post
Diesel or gas the compressor uses power, It does effect MPG's. My truck has a slow leak somewhere in the A/C so when its low the compressor will cycle more often, I can feel it kick in and out.

Also, the A/C compressor in some vehicles will cycle with defrosters on, this is also a power/mpg consumer.

Hi Andrew, I see that you have a '99. Is it an early or late?

You said that you have a slow leak? Why not get it fixed? You are running the compressor to death. imo, on the 7.3, the engines does not give a hoot about the AC compressor turning round and round, unless the compressor is screwed up and dragging the serpentine belt because of bad bearings or clutches, or internal failure of the compressor. If your engine (7.3) is dragging when you turn the AC on and the AC is alright, you may need some kind of tune up (injectors?) or new sensors (ICP?)

Some ideas to look at.


AIR CONDITIONER - Ford Truck Enthusiasts Forums

AC problems - Ford Truck Enthusiasts Forums
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Old 10-02-2013, 10:51 AM   #44
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didn't mythbusters do a episode on ac usage and determine that at highway speed it there was no impact on mpg with the ac compressor running due to rotating mass velocity??

if it wasn't mythbusters it was another show...but I do recall watching it....

I dunno, but in my 6.7 diesel ac usage makes not one iota of difference nor can I ever tell if the compressor is on or not, other than the ac light comes on when in auto climate mode....

I will say that WIND is always gonna be the nemesis when hauling a 60+ sq ft frontal area trailer with a 8000lb truck with the aerodynamics of rosie odonnel on an flag pole....gimmie a 5-10 tail wind on flats and ill show you 12+mpg with a 10k trailer....

gimmie a 5+ headwind in Colorado and ill show you 9...truck pulls same either way just visits more diesel stops in winds. and it got WORSE after the lift and 35" trail tires (but I tow with the stockers normally)
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Old 10-02-2013, 11:00 AM   #45
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I think the a/c uses about 7.5 hp so yes it would make some difference with any vehicle.
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Old 10-02-2013, 11:01 AM   #46
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I'm just guessing: I think we're all trained to think that the AC compressor sucks some power and thus MPG. And it certainly does. But it makes less of a difference now that engines make ~300hp instead of ~150hp. Thoughts?
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Old 10-02-2013, 11:03 AM   #47
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buy a diesel that should fix your problem with fuel milage towing...
But will cost you more per liter. @ 50 per gal. Slow down.
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Old 10-02-2013, 11:04 AM   #48
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slowing down, especially since the trailer tires are only rated for a max of 65mph, will help. 60 is the sweet spot for me and my Roo.

not sure what you expected going from a popup to pulling a 4000lbs. barn door behind you.
the average mpg for towing a full height trailer, is 8-10mpg, for a gas engine tow vehicle.
X2
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Old 10-02-2013, 11:36 AM   #49
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I dunno, but in my 6.7 diesel ac usage makes not one iota of difference nor can I ever tell if the compressor is on or not, other than the ac light comes on when in auto climate mode....
X2 other then the light and the cold air I do not know it is running. guess it has something to do with all our modern power we make compaired to the 99SD
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Old 10-02-2013, 08:24 PM   #50
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I think the a/c uses about 7.5 hp so yes it would make some difference with any vehicle.
.

I agree.
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