The Pontiac is a supercharged V6.

I think the only one that will not depreciate in value is the 400E.
They all would probably get about the same fuel mileage and diesel is up now so it would be cheaper to run the other cars. Excpet the BMW.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R