Long story short, my girlfriend needs a car for work and school. I might use it once every two weeks for a trip to the grocery store or out to the suburbs. Since her car is dying, we're purchasing a new one together, since I don't want to feel like a total mooch for the few times a month it might be useful to me.
At the same time, I don't think it's fair that I should have to foot 50% of the bill when I might only use it 10% of the time.
I'm sure that there are other people who have been in similar situations...how do you work this out? It seems a little overly intensive to log hours/miles in the car and split up lease/gas/insurance that way, but I can't think of a more reasonable way to do it.
Thanks in advance for your help!
(P.S. Yeah, I know what you're going to say: "Buying a car with a girlfriend is risky business -- put something in writing." We've got that covered -- we'll have an agreement notorized, etc, plus we've been together for over three years now so it's not exactly a fleeting romance!)