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Old 03-27-2011, 03:26 AM   #1
g1g
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Default Speed

On my 95 Coachman I generally averaged between 15-16 MPG. I usually try to drive between 55-60. My lowest that I ever got was 14 mpg on old gas and 17 mpg both highway drriving. On my last trip I wasn't able to drive due to my medication so we took a friend to do some of the driving. During this trip we only averaged about 11mpg. I am thinking that it is because the other person drove a lot faster. I really can't say how fast as I was sleeping part of the time and just not able to see the speedometer but I believe they were going between 70 - 80 and maybe a little over. We did have an extra person and their luggage, that may count for a small amount but I think the speed was the biggest factor. I am looking forward to see whay I get on my next trip.
Has anyone else actually documented speed and MPG on their B?
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Old 03-28-2011, 01:25 PM   #2
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Default Re: Speed

I've been able to get 20 miles per Imperial gallon (4.5L) on a short (300 kms), flat, almost
entirely highway trip, at 100KPH on cruise control in the Spring or Fall.
I have done this with full fuel, propane, and fresh tanks, and empty holding tanks.
So that would read as ideal conditions, pretty much.
If the snow allows, I may try to see what numbers I can come up with now, and may compare
to what the Scangauge is telling me, should I ever get a chance to plug it in. It's bloody cold here!
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Old 03-28-2011, 01:28 PM   #3
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Default Re: Speed

I've been able to get 20 miles per Imperial gallon (4.5L), and sometimes a bit more, on a short (300 kms),
flat, almost entirely highway trip, at 100KPH on cruise control in temps well above freezing.
I have done this with full fuel, propane, and fresh tanks, and empty holding tanks.
So that would read as ideal conditions, pretty much.
If the snow allows, I may try to see what numbers I can come up with now, and may compare
to what the Scangauge is telling me, should I ever get a chance to plug it in. It's bloody cold here!
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Old 06-17-2011, 02:47 AM   #4
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Default Re: Speed

I changed the air filter on my unit and the mileage improved by 5 mpg. The tailpipe was very clean, no indication of running rich. But it's still lazy when merging or climbing a grade. Dodge 250 with a 318 (5.2L) engine.
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Old 06-17-2011, 01:49 PM   #5
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Default Re: Speed

WOW!! 5 mpg from a $20(?) part.
Excellent investment.
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Old 06-17-2011, 07:08 PM   #6
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Default Re: Speed

Well, maybe I drove a bit slower too. The air filter was not that dirty. Nevertheless, I was pleased.
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Old 06-20-2011, 05:27 PM   #7
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Default Re: Speed

We get an extra 2 MPG when we drop from 65 MPH on cruise control, to 55-60 MPH off cruise control. No trouble getting 15-16 MPG on the interstate, and 14-15 MPG on the 2-lane highways.
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Old 07-28-2011, 03:48 AM   #8
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Default Re: Speed

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.

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Old 08-08-2011, 04:59 PM   #9
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Default Re: Speed

We tried one or two steeper grades last summer in Lake Placid, and farther east, and saw similar rapid rises in
water/engine temperature. We only have the gas 350 V8, and it struggles, when presented with a 6% grade or higher
in hot weather. Not enough torque, I guess. I often slow down going up steeper hills in cooler weather, just because
I'm (I think) under powered when loaded up.
I actually had to pull over and turn around on one road in Lake Placid, where we wanted to try to get up a ski area
hill for the view. The temp gauge jumped up after about 30 seconds of climbing. Glad I didn't damage a head gasket,
or the weak intake manifold gasket, which I eventually replaced later anyway, due to the (Dexcool related?) leak.
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Old 08-08-2011, 07:22 PM   #10
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Default Re: Speed

So many factors enter in to mileage, Mike. Speed is one. Style of driving another important one (smoothly and with anticipation ahead of throttle changes), grade, altitude, wind, tire pressure, engine condition and tuneup, brake useage. Acetone as an additive to fuel (that from a high school-mate of mine who is playing with it and finds no measurable change, but he's an educated tinkerer who also is working on fairings to clean up aerodynamics).

My solution is work off the top half of the tank and don't largely worry about it other than to keep an eye on big changes that might signal something important. If you can afford it and can't get it to run on peanut oil (your Pratt and Whitney jet engine :drinkers: s will) or something like that, just go and enjoy.
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