I can't speak to the C-15, but we have a C-12 in our 2000 Beaver Patriot Thunder and our onboard computer shows an 8.1 mpg average for the first ~72,000 miles of the coach's life. The coach weighs ~33,000 lbs and we tow a car that weighs another ~3,400.
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Joel (AKA docj)--
RV Technology Specialist
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