I did a little math.
Miles: 100000 Gas: 3.85 Diesel: 4.1
Car Initial Price "Avg" MPG Gallons Used Fuel Cost Total Cost /Mile
Tacoma 26000 17.5 5714.28571428572 22000 48000 0.48
STi 36000 20 5000 19250 55250 0.5525
A3 33000 36 2777.77777777778 11388.8888888889 44388.8888888889 0.443888888888889
WRX 26000 22 4545.45454545454 17500 43500 0.435
Before Insurance and repairs. Insurance should be worst for the STi, I would guess the WRX and A3 are close, with the Tacoma being the cheapest. This does not include repairs, which will add up more quickly on the A3.
Gah, dumb formatting from spreadsheet to forum.