Math time!
Cadillac (guessing) 17mpg city / 0.059 gallons per mile
Jetta: 38mpg city / 0.026 gallons per mile
Cost per mile @ $1.80/gal:
Cadillac: $0.1059
VW: $0.0474
Dfference: 5.85 cents/mile
$5000 / $0.0585 = 85470 miles
If you pay $5000 for the VW it'll take 85k miles (7 years if you drive 12k mi/yr) to pay for itself with the difference in gas costs. Of course if you sell the Caddy that'll help, but buying a new car to save on gas rarely makes sense.
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