Can you even begin to tell us how (the mechanism) you would go about regulating who is selling "old gas" vs "new gas". The cost of regulation would have to be passed on the consumer and the cost of gas would be higher yet. Why do think you have to find some way to control this?
Profits as absolute numbers are meaningless. You don't know the size of the asset base (return on assets could be low even with large profits).
I find this entire idea of somehow either the govt or the oil cos are ripping you off is ludicrous. Gas prices were increasing long before Katrina; due to high demand and constricted refining capacity. How many of you environmentalists have allowed a new oil refinery to be built in your backyard in the past 20 years. There have been few refineries built in 20 years but global demand has skyrocketed.
IMO, some of the emotional types need to do some research on the oil exploration process, the state of world oil reserves, refining capacity, global supply and demand curves, etc. Then add in Katrina knocking out about 1/3 of total US production, and at least 8 major US refineries. Then add in the "fear factor" of everyone gassing up at the same time as they think it's going higher tomorrow. And the traditional Labor Day Weekend high demand in NA. Now, add it all together and you have the reasons why gas costs more than you like it to be (not even mentioning "fear" on the futures markets where gasoline futures are traded).
Having said all that, reports of $1.80/L gas in Burks Falls, ON (wherever) sound a bit like local greed on the part of one (or maybe 2) station owners. Gas around here seems to be settled in around $1.189/L now.
Do some research before you complain irrationally. It gets tiresome.

And if you really want to read some plain stupid and totally irrational responses - go to the Detroit News "CyperPoll" section and read the letters posted there. It makes all the complainers on here look like geniuses.