Well, the efficiency of any car is decreased when driving short distances (4 miles to work), and that includes hybrids. With 100% city driving, a hybrid would probably be better than any other new car. Financially, though, it rarely makes sense. Here's an example:
Let's say you buy a good used Toyota Corolla for $12K which gets around 30mpg. You drive 15k miles a year @ $4/gallon x 500 gallons = $2000/year.
You're not happy, so you buy a Prius for $25k. We'll be generous and say that you average 60 mpg. You only burn 250 gallons, meaning that you save $1000 a year. Congrats, you only have to drive the Prius for 13 years before you break even.
The point is, do a life-cycle cost analysis if you're really worried about the financial impact. As far as "beating the rush", if gas skyrockets I don't think too many US consumers are going to have the money to buy a new car anyway. Plus, a lot of car manufacturers are planning on releasing more hybrids and diesels (which actually get better gas mileage than hybrids, in most cases) over the next few years.
In your case, I'm sure there are lost of trains that come and go from the plant - just jump on one of those

"It is certain that free societies would have no easy time in a future dark age. The rapid return to universal penury will be accomplished by violence and cruelties of a kind now forgotten." - Roberto Vacca, The Coming Dark Age