I put an Oil Price widget on my home page a while ago. I'm also considering writing a little program that checks the closing oil and gas prices every day and saves them, so that later I can go back and do some statistical analysis. That hasn't happened yet. However, after frequently eye-balling prices for nearly a year (including the fall from the $140 high to it's current near-50 level), I can say that
all else being equal, a $5 change in the price of oil equates to a roughly $.10 change in the price at the pump.
Of course, this is highly un-scientific. At best, it probably only holds in my local region of the country, and other forces often have a greater impact on the final price. However, it's worth mentioning now because oil has risen about $5 over the last few days. It's might be worth-while to top off your gas tanks in the next couple of days.
The current local price is $1.999 per gallon. If I'm right and if the price of oil holds steady, it will be $2.099 by the time I come home from work Thursday if not sooner. I'll post back then and see what happens.