THOR currently is replacing all E350 chassis in their Class C's and Vegas/Axis models to E450. This may not be a permanent change but IS the current fix due to a problem meeting CAFE standards.
Corporate Average Fuel Economy (CAFE) are US regulations related to DOT, National Highway Traffic Safety Administration (NHTSA) and Energy Policy and Conservation Act (EPCA).
I received this information from George in customer service today!
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