A friend of mine has a gas 510 combine that has been sitting a shed for 15 years that he will sell to me for $500 and he will include a 13 ft bean head for that price. He says it has not been used a lot and is not worn out. Last weekend we put some gas in it and a battery on it and it started right up. It ran real good. I only farm 80 acres, so I don't need a big combine, but am a little worried about how much fuel it will burn harvesting beans and corn. Anyone have any experience with a gas 510 and knows how much fuel per acre gas 510's use? My Dad used to run a 750 diesel and it ran about 2 gal/acre, so I expect the gas combine will be 3 or 4 at a minimum. As long as fuel cost doesn't get out of hand it doesn't look like a bad deal. It is probably worth $500 in iron. I appreciate any input. Also, I plant 6r30 and I think a 6 row corn head is too big for a 510. Will a MF 1133 or MF 33 head work on a 510, or is the combine too wide for that small of head?