Al-n-Sue, you can find a most up-to-date article that addresses your original question "Diesel/Flexfuel/Gas..." in the current issue of Motor Trend magazine (July issue page 74). The article is titled "diesel revolution", but after reading this technical and well researched discussion on the subject, it is clear to me that the "diesel revolution" may not be that great a revolution after all--at least not for those of us who tow lighter RV's.
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