Just a poll of what people have experienced mileage wise post EFI? Primarily LBZ's please. Driving very conservative on economy, the best I've got is 18.1. Yes, papered with GPS. Towed a 6x10 covered trailer with 300lb paylod driving 60-65 and got the most, 13. New fuel filter, clean air, full synthetic. Sorry to be so long! Any help would be appreciated.