Have you try 2 stroke oil? Guys are getting good mileage. It's worth a try plus it helps lube the vp.
Eugene
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98.5 2500 slt, 24v,quad cab,2wd, longbed, auto. amsoil air filter, II stage 2 injector, VA V5, stock straight pipe, fass hpfp. FP/pryo/trans temp gauge.