[brucepick]

Short trips = most of your drive is spent warming up the engine.

Commit to getting the best possible engine block heater (EBH), professionally installed.
You can change to smaller and lighter vehicles and ones with a standard tranny but you can really help yourself by preheating the engine electrically. The cost of the electricity will be far less than the cost of the gas that now does the job.

I say pro installed because I believe the most effective EBH is the kind that installs in the block's freeze plug opening. Unless you're experienced and intrepid, they can be a pain to get at. And you want it done right because you don't want a coolant leak.