Learn to be a hyper-miler. That's nothing but changing driving habits to consume less fuel.
It's fun!
Simply discover and use every little safe legal trick that gets you where you need to go while consuming less fuel.
So you're gonna learn to shift into gear and start rolling as quickly as possible when starting up.
Accelerate slowly. If you have an ECO light, learn to keep it on by sparing the gas pedal.
Don't exceed the speed limit. Slower speeds generally get better mileage as long as you are in your highest gear.
Time the traffic signals. Ideally, you never stop. Look ahead, see a light changing, foot off gas. Car in neutral. Start coasting. The best case is the light flips green before you get to the line-up of speed racers waiting for it. You just roll on through. Back in gear, back to watching the ECO light.
Inflate tires to the max allowed on the tire. Take curves and turns as fast as is safe.
Reduce the use of the AC. You can still use it and save gas. Set the AC to the coldest setting, recirculate, and the fan on high. When you feel a little chilly, turn off the AC button but let the fan keep blowing. Turn the AC button back on when it gets too warm. Keep repeating that. The AC button is the gas-eater. Only keep it on when needed. The vents will still blow cold for a while when it is off, and you're saving gas while it is off.
If it's nice enough to have the AC constantly off, keep the windows almost all the way up for ventilation at highway speeds. Fully open windows cause turbulent airflow and waste gas.
Find a 'follow vehicle' for highway driving. Keep a safe distance behind a large vehicle. This reduces wind resistance and increases mileage. You don't have to get unsafely close for this to work. Safe distance, the effect still works better than no follow vehicle.
Turn the car off while waiting at lights. Particularly if it is a large intersection and you just missed the green. A lot of modern cars do this automatically as a way of saving gas. It's no secret that having the engine running while not moving is a big gas waster.
Park in a spot near the road, not near the store. Walk across big parking lots. Choose your parking space so you can pull forward without using reverse when leaving. Best case is a space where you can see if traffic is clear to pull back out onto the road before starting your car.
Have your car properly tuned with a fresh air filter. Empty out any unneeded items so you're carrying around less weight.
Multi-purpose your driving trips. Save up errands, do 'em all in one trip going from one to another on a planned route.
The fun comes when you begin to add up your savings. Check your mileage before you start this. Then check again after you try it. You might be able to make your car go 1.5 times as far on a tank of gas. That would cut the amount you're spending at the pump to 75% of what you are paying.
If your car normally gets 20 mpg, and you can increase that to 30 mpg that represents a lot of money. If you drive 15K miles per year at 20 mpg and $4 a gallon, Here's the math: 15K miles / 20mpg = 750 gallons. 750 gallons * $4/gal = $3000 per year in gas. Now, with hyper-miling here's the math: 15K miles / 30mpg = 500 gallons. 500 gal * $4/gal = $2000. You could save $1000 per year. And that's just the gas. Your tires and brakes will last far longer than hard driving habits. How much do they cost you?
Hyper-miling saves gas, saves money, saves tires, saves brakes, and saves the environment.
Hyper-miling reduces gas prices by reducing demand.