Hmm... Well buddy, we don't really have any diesel cars here- SUVs or Minivans so thats not really relevant because American is the country with the SUVs.
well diesel is the best for hauling stuff around and towing
well you can get a gasoline sharan with 150 hp and around 30 MPG though nobody actually buys those
and from the renault they have a 2.0 turbo who gets 29.4 combined and has even 170 HP
and that's the worst you can get from sharan and grand espace in terms of fuel consumption .. there are still plenty alternative for those who don't need 150+ HP