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Open Roads Forum  >  Class A Motorhomes

 > Improve gas mileage for Class A

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nancy Elkins

7320 Clark Circle, Mechanicsville, VA

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Posted: 08/11/12 08:49am Link  |  Print  |  Notify Moderator

I have a 1990 Bounder, 454 Chevy Engine, 8 cyl. Towing Saturn stationwagon, 4 wheels down. Last trip in 90degree temps. Dash A/C used. Interstate driving. Mpg was 5.3. Would I get better mpg if I used the roof A/C instead of the dash?

Other suggestions?

Oasisbob

Portland Oregon 97266

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Posted: 08/11/12 08:56am Link  |  Print  |  Notify Moderator

You would have to run the gas generator to make that happen so overall fuel consumption probley be worse. Bottom line is you own a gas hog. You could tweak a few things but not going to help much. Sorry.


Oasis Bob
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enblethen

Moses Lake, WA

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Posted: 08/11/12 09:26am Link  |  Print  |  Notify Moderator

What was your speed? Slow down to around 55-60 will improve your mileage.
You may want to check your wweight. Rig may need to go on diet. If you haven't used something in the last couple of trips, you don't need it.


Bud
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pulsar

Lewisville, NC

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Posted: 08/11/12 09:36am Link  |  Print  |  Notify Moderator

Moved from Forum Technical Support.

kalynzoo

Los Angeles , California

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Posted: 08/11/12 10:01am Link  |  Print  |  Notify Moderator

My previous Holiday Rambler 454 at very best approached 8mpg. For sure 5.6mpg is on the low end but depending on your speed, the grade of the road, wind, tire pressure, and the quality of the gas, 5.6 might not be unreasonable.
When I used my Onan generator to run the twin roof AC units I burned about 1 gallon per hour. My current generator burns closer to 2 gallons per hour.
My friend had a Banks unit on their previous 454 Fleetwood. The said it improved their ability to pull an 8% grade, often encountered in California, but they did not really get better gas mileage....un scientific, gathered from the fact that we both stopped at the same fuel station together.
That leaves you with a few choices: Keep you speed at a "sweet spot", mine was 55 to 60mph. Check your tire pressure, tracking and balance. Avoid travel during heavy stop and go traffic. Gee....I sound like a DMV commercial...Sorry.
Anyway, Happy Trails.

Weathertodd221

FL

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Posted: 08/11/12 10:08am Link  |  Print  |  Notify Moderator

Id start with a basic tune up (plugs, wires, air filter, ignition cap & rotor) then cold air intake and if you have the $$... headers/exhaust.

chuckftboy

North Florida

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Posted: 08/11/12 05:38pm Link  |  Print  |  Notify Moderator

don't feel bad, my V10 only gives me 6.5 at best. I get 7.5 mpg when using the house air and not the dash air at 67 mph its pretty much a wash for me but the dash air keeps us cooler


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Stim

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Posted: 08/11/12 05:26pm Link  |  Print  |  Notify Moderator

Generator/AC will use less fuel. 4KW Onan is rated for 1/2 gal an hour.

dalmationlovers

Bremerton, WA

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Posted: 08/11/12 06:03pm Link  |  Print  |  Notify Moderator

You are pretty much in the ballpark. I have an 87 Allegro and get 5.35 all the time. It's tuned perfectly and I don't drive fast. My mechanic said the only thing that might make it better is a new improved carb. I don't feel like spending hundreds of dollars to improve a couple of mpg. We travel less than 2k a year so the dollars don't add up.

Gale Hawkins

Murray, KY

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Posted: 08/11/12 10:49pm Link  |  Print  |  Notify Moderator

The two things that helped the most on our 1992 454 TBI as going to the smaller 225 70 19.5 tires and using 93 octane gas. Note we do not have a carb.

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