YES more then one team is ok, join all that fit.
for example I am in two, Toyota and boat tails. my goal for the boat tail team was to get all the highly modded (cars and or drivers) in one team so others can see the combined MPG and % over epa possible. to me the MPG number is great but the % over epa shows how much you are trying. Car with no mods can still be 20-50% over EPA.
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