I have a truck, but I seldom drive. I even moved into town so that I can do almost everything by bicycle.
My wife doesn't ride, but she spends about 50% her time out of town for work, so both my truck and her car sit idle most of the time.
Since it's a new year, I decided it's a good time to start tracking every mile I drive. I already track bike miles. My goal for this year is to ride more miles than I drive.
The hard part of this is that I'll be using the truck for longer trips that aren't practical for biking. I won't fly anymore, and I have to attend a conference in Orlando this summer.
Some of my co-workers complained about the recent increase in gas prices. I HAD noticed, as I had just filled the tank on my truck, but that was after two months of not buying gas.