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How many miles per gallon can be expected for a 1970 Winnebago Brave with normal highway driving?

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Wondering what I can expecting in MPG for an RV listed for sale in town.  The price is right but the age and possible gas cost is daunting.  Thanks for the help!

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I have a D22 with the 318 and after several trips the longest so far being 500mi, I am getting around 7.5mpg and just like you I was quite disappointed.

I purchased the motorhome several months ago and it already had been upgraded with a new intake and carb and a dual exhaust so my expectations were high.The guy I bought it from must also have been high because he said he could get 12mpg while towing a car!! HA! HA! Must have been going down a really steep hill. I have checked the position of the choke (manual choke) and it is fine. I also removed several spark plugs and it appears to be firing normal.

I am very pleased with power and how engine runs overall but fuel mileage is not what I expected, but when you factor in the added comfort and the savings on hotel rooms I guess I can’t complain.

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