Most efficient roadtrip vehicle to convert??

I'm looking for the most efficient vehicle that could hold a twin mattress plus two to three people for climbing roadtrips, to be converted to run on veggie oil. I've been looking at Ford E-350s and other fullsized vans, but I'd want something smaller.

Does anyone know of smaller diesel van that I could find used? I don't need anything powerful, just something big enough to sleep in, put climbing gear in, and get good MPG. A four-cyl with front wheel drive would be ideal.

Thanks so much for the help! First time posting!


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