A very good question but one that only you can answer. You will not notice the difference in mileage between the three different configurations. The newest one is quieter but I suggest you try putting down all the flaps as if you were going thru a storm and drive and see if you notice anything wrong. If it's a used cart its a roll of the dice. Sometimes you win sometimes you lose.
If you did decide on a cart with a carburetor and you had a problem a replacement is under $100. Good Luck. Your asking good questions. Keep 'em coming.
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