I think it depends on the length of the trip. We would often share cars with friends if we are going somehwere together - and if I was going anyway, then I think there is less onus on them putting up. If you are (for example) going for a weekend out in the country, it is more than likely that the passenger would pay a large proportion of the petrol money, or that everybody would pony up.
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who hid my keyboard's PANIC button?
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