I usually flow with the volume - preferring to trade the month(s) with the highest volume. You will notice a lot more gaps in prices in months that don't have sufficent volume.
As far as the last day you can trade a contract, I think that depends more on your broker than CME as usually your brokers expriration date will be before the official CME date.
Hope that helps
As far as the last day you can trade a contract, I think that depends more on your broker than CME as usually your brokers expriration date will be before the official CME date.
Hope that helps