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Old 09-12-2005, 07:19 PM   #15
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1994 30' Excella
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Milwaukee , Wisconsin
Join Date: May 2004
Posts: 1,891
We just returned from a 1100 mile trip up one side of the Mississippi and down the other in Wisconsin and Minnesota. Averaged 14.7 MPG highway, city and town road driving. We pull a small utility trailer with our bikes and a load of firewood, and supplies We kept our water tank full due to the questionable water fills in the parks. Diesel price was pretty steady at $2.89.

Chaplain Kent
1994 30' Excella 1000, Chummy III- Ford Excursion- 7.3 Turbo-diesel
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Old 10-07-2005, 10:25 PM   #16
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1982 31' Airstream 310
Longview , Washington
Join Date: Sep 2002
Posts: 269
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That about the same I get with My 31ft. M/H. I get 13.7 to 14.0 GPM. Thats going up hill or going down or if I'm towing a Jeep back of it. It's the best M/H I ever had. I'll think this is going to be the last one I'll ever have, or want to get.


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Old 10-08-2005, 08:18 AM   #17
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1984 28' Funeral Coach
Belleview , Florida
Join Date: Jun 2005
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Re-Jet the Quad?

I've been getting a combined 7.5 with the generator running full time.... figure 8.5 actual and I don't worry too much about speed as I'm on and off the throttle with my stops at every golf course or retail golf shop.
I can't wait to get back home next week. I really want to get the carb overhauled before/after putting an exhaust gas analyzer on the beast. I can smell the rich, raw fuel going to waste with the current setup.
Has anyone got the economy figured out for re-jetting the quad?
Glen Coombe AIR #8416
1984 28' Funeral Coach
Former Rolling Showroom & PuttLab (now party bus)
"I'm not an expert. But I did sleep in an Airstream last night."
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Old 10-08-2005, 10:14 AM   #18
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1986 34.5' Airstream 345
Louisville , Kentucky
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Have you considered just simply a rebuild on the carb? I ask because I was dealing with an over-rich condition on mine; rebuilt the carb, replaced the distributor, ignition, etc. Also added headers and free flow exhaust. I'm now getting an honest 8.5 towing my beetle behind the 345 and 9.4 empty (no TOAD, no water, etc.). I typically drive between 55mph and 60mph on highways.

Been shooting for the magic 10 mpg but don't see it happening without FI or some other BIG ($$$) mods and it doesn't seem worth it now for the 1/2 mpg. Other than considering swithing to diesel someday I think I'm done chasing the MPG on the current platform.

You might just find that a good rebuild and resetting the float could be all that you need. The rebuild kit is cheap and you can do it all on a Saturday. Bring the carb with you to the parts store as the kits a very specific to the serial number of the carb.

You can also expose the idle mixture screws by cutting the base plate and popping out the plugs. Idle mixture always seems rich on these 454's and this can help get things right. There is a good book on this available from Amazon. Something like "Rebuilding the Rochester Quadajet"
Steven Webster
1986 Airstream 345 Classic Motorhome
AIR 1760
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Old 10-08-2005, 12:32 PM   #19
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1984 28' Funeral Coach
Belleview , Florida
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Steve, thanks for the info. I think I'll leave the carb work to my paid expert. I'll stay home and make appointments for the next week on the road.
I'm getting ready to take the header collector reducers out and go 3" all the way back. New free flowing mufflers and such. This should solve the constant need to tighten the collector bolts!
I'm better on the phone than on the wrench. I also don't get bloodied on the phone very often
Glen Coombe AIR #8416
1984 28' Funeral Coach
Former Rolling Showroom & PuttLab (now party bus)
"I'm not an expert. But I did sleep in an Airstream last night."
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Old 10-08-2005, 01:05 PM   #20
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Corpus Christi , Texas
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We just returned from a month long trip to Amarillo, Santa Fe, Capital Reef NP and Glen Canyon, Bonneville Salt Flats, Sonoma/Napa, Sequoia NP, and the Albuquerque Balloon Fiesta. Total miles traveled was 6329. We were pulling our '97 Excella 25 with a Toyota Tundra. The first tankful we got 12.7 mpg. I adjusted my tow speed to 58-60 and drove extra conservatively and ranged from 13.6 to 16.5 mpg per tankful for the rest of the trip. Mostly it was right around 15 mpg. This included a lot of mountainous driving. We thought the gas mileage wasn't all that bad and it helped take the sting out of filling up with $3 plus gas.
So Long!
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Old 10-08-2005, 04:20 PM   #21
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1976 27' Overlander
Richmond , Virginia
Join Date: Jul 2003
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Mid 11 mpg

Towing our 27' Overlander (about 6000# loaded) in the Virginia Mtns we averaged 11 mpg. We are towing with a 2500 Burb with 3.73 rear end 6.0 Vortex. My average speed is around 60-65.

Same roads solo and 73mph we get 17mpg.

"Abe" & Melissa Lincoln
1976 Overlander "Spirit"
2005 Suburban w/q-steer
Hensley Hitch
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