By Chris Clackum, NBC News
As tempting as it may be right now that some additive or gadget that will increase fuel efficiency, automotive experts say: don't fall for it.
Philip Reed at Edmunds.com says the old ways are still the most effective ways to increase fuel efficiency namely, adjusting your driving habits like letting off the accelerator.
"High speeds are gas-wasters and it's particularly true over 70 mph because of the aerodynamics," said Reed.
For each five miles per hour above 50, add a quarter to the cost of a gallon of gas.
A car left running in idle is guzzling more than we realize, and try walking instead of taking short drives, because those short drives are the most inefficient.
When buying gas, know whether high test is required for your vehicle or if it just recommended.
"If it's merely recommended you could experiment with a lower grade of gasoline, either mid-grade or regular, and save quite a bit of money," said Reed.
Another way to measure gas mileage is to do it yourself by comparing the number of miles you get from one tankful to another.