there is a thing on mapquest that will calculate your fuel cost for a trip... you enter your mpg and it gives you an estimate. of course who knows what gas prices will be tomorrow, much less that far in advance, but it can give you a good ballpark to shoot for right now, and if gas prices drop (yay) youll have a bit extra spending money, but keep an eye out for if they raise.
my thinking on taking trips is that what good is money if youve saved it in a bank instead of investing it in memories. i would do anything, even charge tickets or get a loan (DR would yell, i know) to get to go see my great-grandfather again. he is having his 85th birthday campout next weekend and we cant go.
and my parents are trying to save money so they can leave something behind when they are gone, but in doing so they dont have enough to fly over to see their new grand-daughter. i told them that no amount of money is worth forgoing family for. if its a frivilous trip then no way, but if its something like you havent seen them in years, or it might be your last chance to see an older relative, then go for it.