Unfortunately burning these fossil fuels produces carbon dioxide, a greenhouse gas, around 6 pounds of it per gallon of fuel. Try to stay with me as I go through the math, 25G fuel tank * 6lbs per gallon= Erratic weather patterns and an unhappy enviroment (and 150lbs of CO2)
We can help the Earth out if use this fuel efficiently. There is a way to drive to increase your MPGs drastically. How drastically? I have personally gotten a Ford Excursion to go from 8-9 MPG City to 19-23 MPG City. That's almost a 300% improvement! There are no modifications needed to your vehicle, BUT a vacuum guage is a helpful learning tool, plus they look cool and give the impression that you know what your doing and we can all use that.
Disclaimer: I don't take any responsibility to any harm done to yourself or your vehicle. I have done and performed the following operations daily. They are safe.
Step 1: Essentials
Vehicle with an operational engine
Vacuum Gauge (Highly recommended)
Willingness to learn (this is no problem with the instructables crowd)
This method works for Electronic Fuel Injected and Carburetor engines. Also with Automatic and Standard transmissions.
Step 2: Let There Be Savings
If you managed to do all of the above without causing a ten car pileup, congratulations. However out in the distance, say 500 ft away, you see a light turning from a beautiful green to awful yellow. Using your sense of reasoning you realize that it will turn red before you reach it, meaning you'll have to (or should) stop. So what your going to want to do is release the throttle and shift into neutral, and coast right up to the red light. The same goes for stop signs. IF DRIVING AN AUTOMATIC BE CAREFUL NOT TO SHIFT INTO REVERSE you'll break your transmission
Step 3: Building a Relationship With Your Vehicle
1. You've probably heard this countless times but having properly inflated tires and the correct amount of lubricating and cooling fluids will increase mileage and part life.
2. Get the idling pressure. It should be around 20-23. You'll use this as a reference to know if your driving efficiently.
3. Anticipate stops or other obstacles that would disrupt your path.
4. Do the speed limit or close to it. Most vehicles cruise most efficiently around 40 mph. Remember every 10 mph over 65 mph can decrease your gas mileage by 15%.
5. Avoid aggresive driving, try to stay smooth and steady.