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Any way you cut it, 100 MPG at 60 MPH steady-state is gonna be a tall order!
Vintage looks will make it even tougher, since almost all vintage cars have poor cD and even the ones with a decent cD have a pretty large frontal area.
This point has probably been made, but I'm way too lazy to read through 20 pages:
The recipe will probably require something very light weight and very aero, with rock-hard skinny tires and a tiny engine with a rather tall top gear that can just barely propel the car along at 60 MPH in top gear. Low RPM and 80% throttle opening, or WOT if you can disable WOT enrichment, will give you the most efficient power. Diesel might be a better answer since it doesn't really have a throttle restriction.
-soD
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