I once figured the fuel costs for takeoff and climb to altitude for one of our KC-135E tankers, and I think it ran in the neighborhood of $35-40K. That's just to get up to cruising altitude. I may be way off, but even if you err on the side of caution, and say it's half that -- YIKES!

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)