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How many mpg does a 1986 Coachmen Sportscoach with a Chevy 454? Aaron 5-26-17  
I need to know the mpg of my 1986 Coachmen RV. It has a Chevy 454 and its roughly 23 ft. I cant find anywhere online that gives a straight answer so if anyone could send me a link to a listing on an official website or something of that effect it would be greatly appreciated!
Re: How many mpg does a 1986 Coachmen Sportscoach with a Chevy 454? Bubba The Bus Tech 5-29-17  
There was and is not an official rating.

I have had people claim 10 mpg, They lie!

A really careful driver running a steady 55 mph ( 90 kmh ) might get 10 without wind or hills or a with a favorable tail wind.

Most drivers get between 6 and 8 mpg

It is possible to get less than 5 mpg running 70 mph ( 115 kmh )

Good Luck
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