One year of gas with the 2010 Honda Insight Hybrid
As you can see in the chart, I've averaged 40.65 miles per gallon in travelling 5,913 miles (it's a city car, thus the low miles) using 145.46 gallons of gas for a total cost of $372.52 or $0.066 per mile.
What's apparent is that it doesn't perform nearly as well in the winter (Wisconsin winter) as it does in the summer. I'd attribute this to two factors. One, batteries don't perform as well when it is cold, two, I had to run the heat, which meant I didn't get to take advantage of the idle stop functionality much.
Overall, I'm happy with 40 mpg. However, I was really loving the 47+ mpg I got in August.
If you are curious as to my driving habits, I did the entire year in Eco mode, but didn't drive much differently than I normally would. I did try to use hills to coast and never slammed the gas. I won the Eco Challenge game back in February so I guess I'm a master hybrid driver.
Cold weather battery performance is a huge issue for me as I look for my next car to be 100% electric. I know GM just finished a ton of cold weather testing for the Chevy Volt and they were pleased with the results. I hope other electric car makers are taking a similar approach.
