Secondary O2 shouldn't affect MPG. First will though.
Originally Posted by Balboa
Everybody here always tells me, tires tires tires! Must be RE92!
You can't do too much as well if you live in a place with rolling hills that requires the use of assist.
And there is a reason for this. Like I said, you haven't experienced the Insight as it was meant to be if you haven't felt what RE92s feel like.
When we bought Insight #2 it had some crappy 175mm tires on it. It felt like crap, just didn't want to roll. It still managed 64MPG on the 800 mile drive home, but that's in contrast to my 80MPG in Insight #1.
When we replaced the tires with the RE92s, even my fiancee commented that it felt like a totally different car, and she's not a car person. No longer was trying to keep the battery full a problem. It really changed everything about the car.. MPG, assist profile, regen profile, and just the overall feeling of the car.
As for the rolling hills.. the Insight actually does very well in rolling hills out on the highway. It's the next most perfect environment to completely flat. There is ample opportunity to regen; the key is avoiding the use of assist.. which can be hard to do if you have the wrong tires, lol.