I work at gogovans.com a 12 and 15 passenger van rental company in San Francisco. We've got a pretty big fleet of Fords and Chevys. In terms of 15 passenger vans we've been seeing our customers average between 12-16 MPG, depending on wind and terrain. We do find that on average, customers who request us to remove the rear seat for addtl. storage capacity end up averaging 1-3 MPG better than those who don't.
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