P.S. -- Part of my disappointment with lack of progress is that my first motorhome, a small Class C, almost 20 years ago got 8 MPG. Today a similar size motorhome isn't much different.
In the mean time Class Bs of 20 years ago got 10 to 12 MPG, and today much larger Class Bs get up to 17 MPG on gasoline, and over 20 MPG on diesel. Class B improvement has been considerable while Class As and Cs have improved much less.
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