well it costs me around £50 to fill the tank which is around about $100, usually fill it up twice a week, so around about £400 ($800ish) a month
you say about loads of small engine cars, my Megane (the yellow car) was only 1.6 16v, but i was spending around about the same in fuel
i get paid £16,000 a year by being in the Royal Air Force, each month roughly have £300-400 to spend on myself and the gf, not much really, as living over here is more expensive than over there