I looked at that question on 4020 a few years ago. I bought a gas 4020. The $4000 price premium for a diesel would have bought 65 cent (farm price) a gallon gasoline for 14 years of operation. All the fuel for those 14 years. Things were worn, like the float needle and seat and choke and it used even more fuel than rated and burned 400 gallons the first year working the same ground and passes that took three times the hours with a MF-135 on 100 gallons of fuel. After weaning the 4020 did that task on 250 gallons of gasoline. The gas tractor probably can run on ethanol based fuels with some tuning, I know how to tune a gas engine, gas engines tend to be far easier starters in cold weather, the original diesel injection pump has a reputation of needing a $500 rebuild at this age. When I was shopping biodiesel wasn't available. The generator on either gas or diesel is wimpy and for short operating periods it won't keep up. At night it won't keep up. An alternator is in order. The 24 volt system for the diesel works, but requires extra care and some users don't understand it to give it the right care. Like the 4020 there are three versions of the 3020 family, early, middle, and side console. I don't know about the 3020 but the 4020 side console is so different it has its own parts catalog and shop manual. Early would be oilbath air cleaner. Wiring is totally different for each of those three stages. You can get a hint of the differences by studying the I&T manual for less invested cash than the Deere shop manuals. Gerald J.
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