Tom,
I have a rather unique situation regarding the out-of-town jobs. Most are at Nursing Homes. They run one-hour only, and, although we don't charge the Nursing Homes anything, we are well-compensated. We try to group the jobs where we will do two, three or four in one area in one day. (I have found that 4 is too many, even if they are only an hour!)
On "regular" jobs, I certainly calculate the distance and travel expense. Around sixty miles is generally as far as I go for anything close to regular price.
It seems you are always worth more out of town that you are locally. Years ago I was asked to do a wedding reception in Dallas (150 miles). I shot the guy what I thought was a ridulous figure for the times, $1000. plus room and travel expenses. He said o.k.
When I arrived, I found an 8-piece band set up already. It turned out he only wanted me to play the band's breaks. I played three 15-minute sets, ate the shrimp and prime rib, spent the night in the motel with my wife and drove back the next morning. If only those jobs were more frequent!
DonM