The other Internet myth often repeated is that the V10 is a gas guzzler. I don't think it is. The BSFC may not be the best by modern standards but it's not that bad either. If you replaced the V10 in most large Class As or Cs with any gasoline engine, the MPG would be just as horrendous.
This happens because large motorhomes require a lot of power, not because the V10 is all that inefficient. Unfortunately, V10s are often used in heavy duty applications requiring over 100 HP on average, so fuel consumption is high. And then when the owner only gets 7 or 8 MPG he often blames the engine as being a gas guzzler. Maybe they should blame the MH manufacturer for building a 20,000-pound vehicle with over 100 square feet of frontal area and shaped like a brick.
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