GreenHybrid.Com has a database of real-world mileage reports from hybrid car drivers. It now has statistics from over 1000 different cars in the database. The site also has an active discussion forum and a learning section where you can read about the basics of hybrid car technology.
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I have some real world MPG figures for cars on my website
http://www.WhatMPG.co.uk
It also shows manufacturers figures for used and new cars.