My suspicion is Card made a very detailed well-thought-out plan that included:
1) Shooting at one end of town (bowling alley) only then to go to the opposite end of town (bar) knowing that all LE would head to the bowling alley first
2) Get rid of his boat days before the shootings, then leave his car at the boat ramp (with another car staged close by) in order to force LE to spend a lot of time there searching the river while in the meantime he is driving fast away.
3) Probably steal or otherwise obtain out of state license plates in order to put on his other car to drive out of state.... APB for LE in neighboring states would be for them to look for Maine license plates.
4) Will probably ditch that car and buy a used car somewhere with cash...and just keep driving. Wild guess.. .he is in somewhere like Louisiana.
The point is, with what is known already about the shootings, I doubt his planning would have stopped at him wanting to go into the woods in Maine and just hunker down. His escape plan was probably "crazy" complicated and extremely well thought out. When you get crazy... sometimes it's maniacally crazy. Those poor poor victims did not have a chance.
I personally think he is hundreds of miles away from Maine.