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I think mathematically, any increase in fuel cost is insignificant compared to the actual cost of your car, therefore, if it 'affects' you, then I'm afraid you couldn't really afford the car in the first place, and should buy an older/cheaper car with the difference spent on the increase in fuel. This cannot be argued with, as older/cheaper cars costs less to buy then newer/more expensive cars, I have the mathematical evidence in front of me for anyone concerned.
[/forum sarcasm off]
I have changed my driving style to eek more MPG out of my commute, and started cycling to work, although I haven't been cycling to save money, just to loose the flab..