Yeah, running premium won't make a difference.
I have almost 13,000 miles on my car now and I just took a trip to a friend's house over an hour away and from door to door I averaged almost 52 MPG. Glad I got the Insight instead of paying $10,000 more to get a 2010 Prius. My MPG isn't much lower than the Prius.
If you read some of my earlier posts when I first got my car, I wasn't all that happy with the MPG as well. It's like they said, you have to wait for the car to break in.
Every 4,000 miles I put in Amsoil P.I.
That cleans out all of the carbon so that I don't have to put in mid-grade or premium fuel. You'll notice that many people start to have their engines ping when they put high miles on the car. That's from the carbon building up inside the top of the pistons and cylinder head. The carbon can cause pre-detonation. People will run higher octane to combat this. The solution is to get it cleaned out so that you don't have to keep running expensive fuel all the time. You won't have to worry about that now, but that's something to think about in the distant future. When I order my oil for the year, sometimes I'll buy 2 to 4 bottles of that stuff and keep it on the shelf until I need it. Every person I've ever talked to in person tells me they love this stuff. I use it now for preventative maintenance.
I was thinking that my car was sort of a gas hog. (I'm getting spoiled.)
Then I went and drove another car for a while and had to fill the tank. I was all pissed off when I had to pay almost $45 to fill the tank to drive the same distance I'd normally go in the Insight for $24-26 worth of fuel. Now I am so glad I have this car.
I was thinking about trading it for another car. After I filled up the tank in that other car, I changed my mind REAL QUICK.
At least the Insight II's are not really slow. They have no problems keeping up with traffic or passing people. I'm still pretty happy with the car so far.
If any of you are starting to get tired or bored of your Insight... trade cars with a friend for a week or two and go back. You may change your mind real quick and appreciate what you got. I know I did.