sounds like one of those too good to be true deals, 23 gph at 450 hp getting real close to 20 gal/hp hour...can use the same operation to get at the other tractor, not accurate as per running until so many hours are used then head for the fuel tank but will show the difference in fuel consumption in relation to each other...Don't use that to compare colors or we all be in trouble...23 gph at 460 hp makes it much easier to see.