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My '71 Dodge Polara 318 2 door hard top probably weighed nearly what your van weighs. It got 15 mpg at 50 mph, at 70 mph, and pulling a trailer or not. Get tbi or a modern carb and a lock up converter or a manual and get to 15 mpg+. If wood burners were so great, the Germans would still be using them (as they did during and after WWII).
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