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Old 03-14-2015, 08:06 PM   #1
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Expected fuel milage

Sorry to ask such a goofy question. The wife and I are looking at a 1989 33 foot class A with a Ford 460. What fuel milage is average for a rig like this? I am guessing about 9. Am I close?
Thanks
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Old 03-14-2015, 08:18 PM   #2
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closer to 7 something.
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Old 03-14-2015, 08:45 PM   #3
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You will be lucky to get 8, just the way all of these things are no matter what engine they have.
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Old 03-14-2015, 08:53 PM   #4
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I agree . If you get 8 I'd be impressed. Expect closer to 7
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Old 03-14-2015, 08:56 PM   #5
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Had a 1997 31' Class C with the Ford 460 and got between 7-8 mpg. Highway speeds were closer to 7 but the engine was strong with good power.

I did have a problem with the exhaust manifolds cracking due to heat, I ended up adding some additional venting up across the manifolds which seemed to have solved the problem.
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Old 03-14-2015, 09:26 PM   #6
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My 96 36 ft class a with 460 averages between 7-7.5. I also had a cracked manifold, & it just didn't have a lot of hill climbing power. Headers helped with power a bunch. If it helped mpg it's minimal.
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Old 03-14-2015, 09:34 PM   #7
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Had a 96 Winnebago Adventurer ... 460 with the banks headers, larger air intake, and banks transmission module and at speeds between 60 and 65 only got about 6.5. Never towed with it. Had plenty of power, but would not pass a gas station!
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Old 03-14-2015, 10:17 PM   #8
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On a 26 year old rig fuel mileage will be the least of your concerns. Maintenance costs will far outweigh 2-3 mpg...

Cheers!
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Old 03-15-2015, 07:02 AM   #9
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Thanks for all the replays. I do know it will need some TLC but I am okay with that. My last mh had a Dodge 440 and got 6 at under 60-65 and at 70 would get 8. Weird but true.
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Old 03-15-2015, 10:00 AM   #10
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We used to have a 2000 31' Class C with the ford V10 and on long trips we have gotten up to 10.2 mpg. The normal was around 7.5-8.2 as long as we were not using the generator. Pulling a 2700lb trailer here in AK we would get a good 7mpg.
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Old 03-19-2015, 12:31 PM   #11
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Our '98 Santara 35' with 460 got 5.5 to 6.5 even after the Banks install. More power with the Banks but not much if any better mileage.

The new to us Magna, when running, gave us 7.1 overall on the only trip we took with it so far. That was from WA to AZ and back and included Tehachapi and the Grapevine.
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Old 03-19-2015, 12:50 PM   #12
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I average 8.2 running 60-65 mph. 2001 Ford F53 V10 (Coachman Mirada)
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Old 03-20-2015, 12:09 AM   #13
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I'd say bad and worse I always tell people if your interested in mpg motorhomes are not for you!!!
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Old 03-20-2015, 12:58 AM   #14
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Find out what the max loaded weight of the motorhome is. Divide this by the HP rating of the engine. If you're moving about 100 lbs per hp, you 'll probably get about 8mpg. Less than 100, a little better; more than 100, a little worse.
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