The diesel vans would be the Sprinter either Mercedes or Dodge, the Transit has a diesel option, and the Promasters have a diesel option. There is also a full size GM van with the new 2.7 Duramax they put in the Colorado. All those Van's will be pricey.
As far as the 30 mpg Caravan, we have a 2011 Town and country we took on a vacation a few years back, I kept it to 55 mpg and ran a 250 mile each way up and back loop and got just a tad under 30 mpg hand calculated. That was in the mountains of Western Montana. We have LRR tires at 50 psi and about 85k miles on it, used the "eco" mode and just took it easy.
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