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Old 08-11-2015, 05:38 PM   #15
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Quote:
Originally Posted by CJ7365 View Post
Yeah I think under 5mpg, which is saying you got 4 MPG, is a bit low, if you haven't done it already, I would go ahead and change out the plugs, wires, cap and rotor, cant hurt, get that carb adjusted and put some fresh gas in there, I would expect at least 6 or 7MPG at 60MPH


Im only at 27' 12,000LBS, also TBI instead of carb, I average about 8, last trip out to Calif. one tank I got 9 all flat land.
I think the standard tune up features of plugs, wires, cap and rotor are a good idea. When I said just under 5, I meant that, not 4. Hard to say exactly, but I got a minumum of 4.93 mpg, most likely a bit more. (based on a too short test, and plenty of idle time after the 1st fill up, and before the trip.)

Since I did not document the gallons per hour idle consumption (I would love to know this number if anyone knows it) nor the gallons per hour consumption from the generator which also ran and runs off the same tank, exact numbers for gas mileage, and my statement of just under 5 was an estimate.

All things considered, I may have been closer to the 6 mpg several have stated, than the 5 I stated.

Thanks all on this thread and site, as it is a real font of information.
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Old 08-11-2015, 06:24 PM   #16
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I would consider throwing a can of Seafoam in the tank as well to help clean and remove varnish.
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Old 08-11-2015, 06:30 PM   #17
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Karl:

We had a 1985 26' Class C with carb-equipped Ford 460. We got about 6.5 mpg at sea-level, but at altitude (over 1500') it dropped to about 4.5. Our '02 32' Class A with an EFI V-10 got a consistent 7.5, independent of altitude.
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Old 08-11-2015, 06:35 PM   #18
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Hi Karl, I was trying to remember back when I had a 1986 Kountry Star with 454 engine. Bought it new, seems she was around 32 feet and never did better than 6 mpg. I think it was really around 5.5 to 6 mpg.
I'm amazed my current coach gets around 7 and has done as well as 9 mpg. I try and keep speed down around 60.
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Old 08-11-2015, 07:17 PM   #19
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Originally Posted by sirpurrcival View Post
I would consider throwing a can of Seafoam in the tank as well to help clean and remove varnish.
That was one of the first thing I added to the tank. I did that when I was working on the generator, before I tried to drive the v8.

So, among several other things that were floating around in the 85 gallons of who knows what, were at least a couple liters of seafoam...

Still and all, I now know that there is a great deal of gas in that tank, and I have an idea of the many hundreds of miles of range that I have in that tank, so I will need to drive it a while before I can be sure of what additives to put in the tank...
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Old 08-12-2015, 07:54 AM   #20
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Karl,
I had an '88 Southwind 28', and I pulled a car trailer with a car on it and got between 6 and 7 mpg. I did some upgrades to get that though. I added an MSD ignition modual, ceramic boot plug wires, and MSD Blaster coil, K&N air filter element and raised the air cleaner about an inch to allow for a smoother air flow. I know Accel now makes a kit for the 454 with new rotor cap and ceramic boot plug wires as a kit, you can check it out at Summit Racing. The above mods increased the mileage between 1 and 2 MPG. It also gained me 5 MPH pulling the trailer & car up the hills on I77.
Frank
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Old 08-13-2015, 03:08 AM   #21
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Nice rig, I have a 82 PA 30 footer with a 454 and I have 99 Deville concours as a toad on a KarKaddy SS
I get 8-9 @ 55-58mph. I too would use a can of Sea Foam or I also use Lucas carb cleaner. I have a 30 gal and a 70 gallon fuel tank both on the passenger side. Don't forget wind which will really play havoc on the mileage.
Welcome,
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Old 08-13-2015, 09:30 AM   #22
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"I had an '88 Southwind 28', and I pulled a car trailer with a car on it and got between 6 and 7 mpg."


Had an identical set up, same mileage too! 55-60 mph max.
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Old 08-13-2015, 11:45 AM   #23
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Nick said it look at the weights even better I did Jim's distributor mod years ago I have 1985 toad is 5500 lbs I get 6.5 pulling a toad 7 not
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Old 08-13-2015, 11:51 PM   #24
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Hi all,

When I had my '77 T/A, we spent some time rebuilding the HEI Distributor, including shimming the end-play and re-curving the thing using a Mr. Gasket weight kit and Crane Vacuum Advance "can." After doing that and tuning the Q-Jet, the thing ran very well - to bad it ingested the vent stack before I could strip test it, but it got much better gas mileage!

Mike and Melissa.

p.s., any one know the max towing capacity for my RV? I want to tow a '94 S15 Jimmy 4-door.
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Old 08-15-2015, 04:46 PM   #25
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My 1988 34-foot Bounder with the carb'ed 454 and clunky 3-speed trans returned a steady 7 to 8 mpg day and night, uphill and down. Never did any real tuning to it, except for the plugs and wires a couple years ago. I think the trans is the real limiting factor here, at 60 I was turning nearly 2800 rpm. There's just no way to get real, noticeable MPG increases without doing something about that. Keep the tires inflated, try to find tail winds, and go downhill as much as you can.
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