Saw this old thread - keep in mind guys that the M1 engine will do just fine a large variety of fuels.
My boss was an M1 commander in the Gulf War and as a reservist drove them again in 2003-2004 - and as he said you can keep it going on just about anything
it will run very well on any aviation gas, jet fuel (various types), gasoline ranging down to as little as 70 octane, diesel, even bio fuels and cooking oils
you have to clean out the filters more but it will work
the tracks are a different story - but keep in mind that Europe by now would be literally littered with dead M1's that they can salvage tracks and track shoes from - and with the reduced operational tempos they may be fine for years
the people who will have problems will be guys like me (I rolled an M1A1 tank) who take them cross country all over Poland - found track shoes and parts in Krakow (where else after all would have them?) but cost a lot
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