How’s your fuel mileage? About how far do you usually go between fill-ups? I assume most of you would answer somewhere in the 300- to 500-mile range. Diesels have pretty good-sized tanks as standard, and they usually have better mileage than gassers, too. But what if you could go 1,500 miles without refueling? Jordan Yankee asked himself that very question, and the answer is Project Long Haul.