Calculate your costs, and make notes of how far you are driving.
For example my current car gets 27 MPG in the city. Breaking that back down to km per litre; it's about 10 km per litre. So that quick trip to the store that is 5 km away costs me about a buck (return.)
Have some numbers for your friends, and ask them to chip in; either each trip or on payday to slide you some cash. Back in high school when we were going to the movies every other night, everybody would chuck a loonie into my drink holder in the car. By the time I was in University my friends would tell me to pull into a gas station on the way home so they could buy me some gas.
Tell your friends. Let them know that you aren't trying to be a jerk, but this costs money.
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