I know most of us are being hit by these high gas prices and have just about slowed to a crawl to go caching. Here are a few tips that I personally have done and done in the past to increase my MPG.
1. Get a new air filter. Preferably a K & N Air Filter. They increase MPG and horsepower.
2. Open up your exhaust. This is where you can be illegal and get away with it. Most country boys have straight pipes on their trucks and they are loud. You can talk to your local muffler shop to help you out with your specific vehicle. Those big V-8's can be opened up to get as much as 5 added MPG. If you don't want the loud roar than check out the Flowmaster Series Muffler. They have a nice exhaust "note."
3. Keep your tires inflated to the maximum allowed. During the summer you may want to go 2 - 3 pounds less because when the tire heats up due to driving they will increase in pressure.
4. Just slow down a little. That is the biggest thing. It's hard to do that, trust me.
I have a 2005 Honda Civic 1. 7 Liter. I have rigged up my own "Cold Air Intake" and took off my muffler. It is a little louder but not annoying like those "Rice Racers." I was getting 38 MPG traveling to Hot Springs from Glenwood everyday. Now by doing all the listed things above I have increased it to 44 MPG. The hardest thing is to slow down from running 60 in a 55 to 50 in a 55. The noise from the missing muffler is not bad considering how much less I have to pay at the pump.
A little sacrifice for more Caching time. I can do it. Can you?