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you NEED to drain the gas if it's been sitting up for 2 years.
Mixing it will NOT work.
Drain and flush it, add some injector cleaner/octane booster, and flush out the fuel lines and injectors as well.
You shouldn't need to remap the power commander, however you should flush the coolant (not just drain and fill, but actually flush) as well. If it's really been sitting for 2 years without even being turned over, it wouldn't hurt to pull the thermostat and clean it.
Another thing that wouldn't hurt, and will only cost a couplea bucks, is to go ahead and throw some new plugs in it.
Once again, YOU NEED TO DRAIN THE TANK AND PUT NEW GAS IN.
didja get that?