just for the sake of looking, i looked at harbor freight's website. their largest generator is a 9000 surge 7250 running watts, 13 hp gasoline. it has a 8 gallon fuel tank. the run time aderstised is 13 hours @ 50% load. could we assume that a diesel tractor with a 6.6 gallon tank and roughly 18 horsepower PTO output would roughly have an 11 hour max run time at .6 gallons per hour? i have seen .6 gallons per hour fuel burn on a BX D902 mentioned in several places. is that the fuel burn at full load? you also have almost 18 hp available at the PTO vs. a 13 hp engine. i just think a diesel engine is more fuel efficient then a gasoline engine. so if i am correct the diesel tractor would be able to run 11 hours (maximum) at full load and the gasoline unit runs 13 hours at only 50% load, then at full load we could assume less then 8 hours?
i also wonder how accurate harbor freight is on their rating. if we assume 2 hp per KW, then 13 divided by 2 gives us 6,500 watts NOT the advertised 7250 watts.