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Old 08-09-2011, 03:16 AM   #11
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Default Re: Speed

I guess the key is to not be in that much of a hurry, which was fine with me.

I did have a lot of fun at a campground with a pretty steep hill. We were near the top and got to watch the jumbo 5th wheels burn several gallons of fuel on their way up. Good times!

Dan F.
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Old 08-21-2011, 06:15 PM   #12
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Default Re: Speed

Quote:
Originally Posted by arrveedogz
Just got back from a 3000+ mile trip through New Mexico and Colorado (mountains!) where we averaged better than 17.5 mpg. I rarely exceeded 65 mph, despite the 75 speed limits. Kept a close eye on engine temp (Scan Gauge 2) throughout. Very fast temperature response to going uphill or downhill - about a 15 degree range.

Dan F.
Back in hot humid Houston
We just got back from a week away. Saw similar temp fluctuations when hill climbing out in Gaspe QC.
I still haven't gotten around to adding the transmission temperature codes (assuming I find them and figure
out how to build my own optional readout), but water temps ran between 188F with no load on the engine downhill
no throttle, and a high of 207F when struggling up a hill with the 4-ways flashing. I'm not sure how useful watching
my transmission boil would be anyway.
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Old 09-15-2012, 03:51 AM   #13
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Default Re: Speed

I haven't driven my van yet enough to know the mpg but I am hoping for 12mpg. I have told to expect 14-15 but I'm not sure about that. But then again, my van doesn't have as high of a top as many vans do so it has less wind drag for sure. Also, mine lacks the emissions system that some vans have (as far as the air pump). But still, a 70's 5.9L V8 engine with a carburetor? Not so sure it's going to get 15 even at 55mph. If it does, I'll be tickled pink. But I am keeping things realistic.. expecting 10-12 hwy.

I will be keeping the rear tires maxed out for air pressure (80psi as I recall, tire capacity) due to the large amount of weight in the rear. Front I will keep around 50psi which I think is the factory spec. I might try 60 and see if it helps and doesn't make it ride too rough.

I had a 1997 Ford E150 conversion van (without a high top) with a 4.6L V8 engine. It got about 14-15 at 70mph and about 16-17 at 60mph. But it had a fuel injection and a smaller engine.
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Old 09-15-2012, 12:10 PM   #14
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Default Re: Speed

Speed does make a big difference in mileage....I can see that driving at 80mph plus would drop the mileage that much
The air filter being clean helps too.....I have never seen a 5mpg difference, but you never know.
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Old 09-15-2012, 03:45 PM   #15
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Default Re: Speed

Quote:
Originally Posted by poncho62
Speed does make a big difference in mileage....I can see that driving at 80mph plus would drop the mileage that much
The air filter being clean helps too.....I have never seen a 5mpg difference, but you never know.
Sometimes an air filter can be clogged and not look like it. I took my air compressor to my mower's air filter and you should have seen the dirt coming out of it. It didn't look as dirty as it was. It's a $25 filter so I try to extend it's life as much as possible.
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Old 01-13-2013, 06:54 AM   #16
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Default Re: Speed

I definitely would say that speed greatly impacts MPG. Air resistance increases by the cube of the speed, so a doubling in how fast someone is going means that eight times as much force is needed to deal with the resistance.
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