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I know the EPA/AAA likes to say you achieve maximum fuel economy from 55-60 MPH, but I find that wind resistance is reduced even more dramatically at say 50 MPH. I had chosen to not buy a scangauge until today so I can find this stuff out, but since I don't have one yet, I thought I'd ask since I've been wondering for quite a while. I have an Automatic 98 Camry.

50 to 55 would most likely be better for your FE. Above this, the effects of trying to punch through the air become more pronounced at an increasing rate.

Now if you've got a huge tail wind, all bets are off. While I've read the AAA saying 60-65 MPH is a sweet spot, I doubt that for most cars. The collective wisdom of this site seems to show that a 45-55 range suits most cars best.

Your ScanGauge can help you determine the best speed range for your particular car on your particular commute.

Generally speaking, your concern in normal highway driving should be moving at the lowest speed that is reasonable and safe for a given road. As long as the car is in its top gear your fuel economy should increase noticeably with decreased speed if you can keep a gentle touch on the throttle. Don't worry too much about "maximum" while you are learning because conditions rarely allow for it.

As for the ScanGauge, it will help you keep tabs on your right foot. Pick your speed, then try to maintain it while keeping the highest instant fuel economy possible.

I agree with KWJ,

Here's a thread (http://www.cleanmpg.com/forums/showthread.php?t=13078) I started yesterday regarding the subject that seemed to raise some controversy.

Kirk

It is constantly changing as cars and gearing get better.
Trying to use numbers from 1970's, 1980's or even the 1990's are irrelevant compared to the newer cars of today.

As far as the AAA's go I have disagree that your going to get better mileage at 65 mph than at 55 mph. I have modified both my cars for gas mileage.
Although they get better mileage at 65 mph over stock they still get their best gas mileage at 50 - 55 mph.

You can't change the Law of Physic's of drag on a moving object as it passes through the air. Nor can you change the Physic's of frictional loses between the road and the tire.
You can improve them but not eliminate them totally.

http://i38.photobucket.com/albums/e101/FogerRox/mpg_vs_speed.jpg