I agree on most of what you say.

Check your car\'s optimal speed. On some cars it is as low as 45mph where others it is around 60.

Smooth acceleration and early braking are essential to conserving gas. When I was 17 and taking my driving instruction, I was told something that I remember to this day... people use two things too much... the gas pedal and the brake pedal.

Air filters are cheap. If you are serious about saving the MOST gas as possible and getting the most HP then get a K&N air filter (http://www.knfilters.com/).

Synthetic oil will allow you to drive up to 25-30,000 miles without changing the oil! Many people change it needlessly at 10,000 which is 3X what they would change convential oil and is the price difference (synthetic is approximately 3X as much). Use a brand name such as Mobil-1 Synthetic oil.

Tire pressure should be on the inside of the door of your car, in the glove box, or in the owners manual. Get a gague and make sure your tires are at the right pressure. Not only will this save you on gas, it will give you a longer tire life.

Take ANYTHING you absolutely don\'t need out of the car but remember to always carry blankets if you live in a cold weather climate even in the dead of summer. The tendancy to forget doesn\'t outweigh 5 lbs.

When buying gasoline, check for the lowest price and use that gas station even if it means going out of your way. NOT to save 50¢ but rather to make sure the competition stays in line with what the "real" gas prices are. ie. If a gas station is at $2.69 and another at $2.65 and nobody goes to the one at $2.69 then they will HAVE to lower their prices. People buy out of conveinence (conveinence stores...) so stores close to the highway or close to a large shopping mall or Wal-Mart (although they do have their own gas stations a lot of times that has gas at some of the best prices... go inside the store and buy a Wal-Mart card and save 3¢/gallon off price of gas) will have higher prices. Again use the web sites in earlier posts to find the station that has the cheapest gas.

I had one in my Mustang and it helped as far as horsepower. The cool thing about it (especially where you live) is that you don\'t have to replace the filters! You can wash them and then you buy this oil and then return the filter to the car. At the time when gas was ~$1.10/gallon I really wasn\'t keeping track of the gas mileage but the way the filter is designed, it is designed to get more air into the chamber therefore increasing the HP and because you are using the same amount of gas and getting a better combustion it only makes sense that you would see some additional gas mileage... essentially more thrust with the same gas (you are just changing the air intake).

For my car that I have now (Hyndai Sonata 2.7L) if were to put in an air filter from K&N these are the estimated stats (from research I have done on the net)

Increased HP: 4HP Gain
Increased GM: 1.5Miles/Gallon (from 23.5 to 25)
Cost: $37.95 is about the lowest I found on the net

A regular FRAM filter is $6.99. Given that you replace your air filter every 5,000 miles and gas is $2.75/Gallon and you are saving 6% on gas 16.5¢/gallon you are saving $33 in gas and a Fram Filter costs $7. So given those figures it would make sense to me to buy the K&M air filter.

Cost/10,000 Miles (6% gain and gas at $2.75):
K&M (modified cost) $38
FRAM (modified cost) $80 (remember you need two filters)

If my math is wrong someone let me know. Also there are "modifications" that can be done that are all over the net depending on the vehicle you drive that will give you an even better performance.

... it seems not all of them work.  :rolleyes:

What exactly do you mean by this.  You mean the mod will not have any affect when performed on some certain vehicles, or do you mean it actually cannot be performed?

After installing a K&N (http://www.knfilters.com) air filter, I am also VERY interested to see what your gas mileage is.

Remember that K&N (http://www.knfilters.com) also sells oil filters as well. Since I use synthetic oil and change it every 15,000 miles it is worth it $$$ for me to use that as well.