In my opinion operational costs are very similar among the high end coaches since many of the same systems are present on all. That would be AquaHot, Cummins, Cat or Volvo engines, tires awnings, refrigerators and small parts such as relays, solenoids and Silver Leaf or Alladin systems. As pointed out earlier, fuel economy is the big number and weight is one determining factor. Newells with four slides are close to the upper limit, as are Prevost conversions. There are whispers that some coaches go out the door in Miami, OK and at various Prevost converters OVER the highway weight limit.
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