I have added my insight back in over a couple of days and am now starting to check out the threads. I removed the cars I had in the database because I had only entered in a few tanks. I think Jason has provided a fine resource here for all to learn from (One that is dedicated to a variety of Hybrids and fuel effecient cars). I had to wait nearly a month to get my insight (bought it new on ebay but they had to add cruise control) and during that time I learned a great deal including the idea of logging every mile driven. In my log I record the odometer reading, trip b (I use this one for tanks), mpg per the car computer, and a manual mpg along with the date. As a result I do not have info on temps, traffic, fuel prices, etc.... I tried to enter the data in accurately but neither my mileage (a couple thousand short), #tanks (3 short) or lmpg (89.3 per my car) match my database. I am sure I put in some bad numbers or skipped over a entry in the 95 tanks I did enter. Additionally there are some things you showld know about my fuel economy.
1. I drive 500 miles on my commute. Nearly all of it is on the Interstate
2. Other than my first few months of ownership I drive around 55 not 65-70.
3. My monthly results are not weighted evenly. THat is if you look at Dec, Jan and Feb you will see those months have very few entrys. After driving my Insight in its first snow storm and picking up several nicks in the paint due to sanding trucks I decided to drive a Civic VX when the weather was bad. When I drive the Insight in the winter it is usually when we have abnormally warm weather. Additionally the Apr - Jun values are a bit lower as the first few months I had the car I was still driving 70 miles per hour or better. My last tank in which I got less than 80 mpg was 8 July 2001. Because of these abnormalities my data does not show a significant reduction during the winter but I know one would exist if I drove equal mileage each month of the year.

Anyway great database Jason. I will look to put some Prius info in next (a lot fewer entries but we do log the mpg just wish it had a lmpg like the insight). I don't keep a fuel log for the Civic VX but over 235K miles I am fairly certain it would have a 50 mpg year round average. I'll leave it out of the database unless I collect more than a few tanks of gas.

Dan,
As has been pointed out a Prius is far more upscale than a Civic VX or Insight. We expect a 04 Prius for my wife on 19 April. I think the Prius is the right choice for in town driving and a manual Hybrid is a btter choice for the highway. Have fun, RIck