European drive about 10,000 mi/year, but mileage is much better than US, on average are much better drivers than US so they know how get better mileage and manage traffic, and drive stick shift cars (and know to use them), and smaller, less truck-like cars.
Europe
10,000 mi/35 mpg = 286 gallons * $8/gal = $2288 per year
USA
15,000 mi/15 mpg = 1000 gallons * $4/gal = $4000 per year
Japan
6,000 mi/25 mpg = 240 gallons * $5.50/gal = $1320 per year