Looking at upgrading my 4wd. Looking at a STX430 and STX 485, the hours are within 100hrs, specs are the same for options etc. The 485 is actually priced better than the 430. Looks like they are both a 12.9L engine. Don't need anything much bigger than 430hp. Will they both use the same fuel doing similar work? Will be pulling a 45ft airdrill.