RV?s - Is 22 mpg highway enough?

Winnebago announced it will be introducing a smaller ?Class B? sized Motor home called the ERA. The ERA is an aerodynamically designed Motor home built on an 8,550-lb. GVWR Dodge Sprinter chassis with a fuel-efficient 3L 6-cylinder turbo-diesel engine. Class B vehicles look like vans, compared to full-size Class A motor homes that resemble buses, and Class C vehicles that have a truck-like cab. With RV industry sales sagging, the only choice is to offer much more fuel efficient vehicles.