Gas Problems

["Jeryd" <Leuck@concentric.net>]

    Could some please tell me what could effect my gas mileage with my 86
4kcsq?  I just filled it up yesterday and now it down to 3/4 tank...  I know
it is not my driving style, because I drove with the gauge reading 25-35 mpg
gallon every where....

Any advice on what might be loose or what needs to be tuned to work right
would be very help full...  I am going on a 450 mile trip and I would like
to get the best gas mileage as I can...

Thanks a bunch!

Jeryd