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I cant say first hand on Mopar v8s but a comparable year Chev or GMC with a tbi 5.7 can range from a best of around 11 or 12 highway mpg (as my old van did) up to 17 or 18. I know of a gentlemen who claims 19-20 with his '93 g20 Chev conversion van. Thats just for comparison sake.
I guess I looked at it this way, my van wasn't my daily driver, but when I did drive it the money for fuel was well worth it considering the convenience that big van was to me. I could haul lots of cargo and/or people and tow. You can camp in them, live in them, and do lots of other things in them lol. My old full size van was more versatile than any car, including my old pick-up, I've ever had. I do miss it. I never did any ecomods to mine, just kept it in a good state of tune, and drove reasonable with it and I still only got 11 or 12 mpg. The original owner, whom I bought it from, only got 12-13 best ever and that was on a long flat road trip when the van was much newer.
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