Do an experiment with your car: on a long freeway drive (one where you'll have to fill up), go 5mph less than usual and see if your mileage improves. In my 2000 Ford Focus I can get about 2 miles/gallon better. Plus I tend to be more relaxed when I'm not trying to pass everybody, which is an added bonus!
Also, I try to check my tire pressure at least once a month. A few psi low can wreck your mileage (and your tires!).
Use an EV for transportation. It uses no gas. You just plug it in a 110V outlet in the evening to recharge. I use a 1975 Vanguard Citicar around town and pass by the gas pumps with a smile.
Ride a motorcycle. You don't need a 4+ passenger car to drive yourself to work.
Also, the state should allow bikes to split lanes in traffic like CA.
Ride a bicycle
I gave up driving my car to work 9.5 years ago and started riding my bicycle. It is not as hard or dangerous as people think it is.In fact I get my one hour workout in everyday and I don't have to spend time at the gym. So not only am I saving gas money but I am also saving the payment to the gym also.
My total savings in gas amounts to one house payment a year.With the price of gas going up I'm saving even more money per week now. At the rate it is going I will be saving two payments a year soon.