I was getting around 80 MPG in a borrowed 2001 Insight a few years ago. That was on 165/65-14 snow tires in the winter! No mods other than tire pressure and a temporary clutch switch. I really need to add a clutch switch to mine, the nearly constant assist seems so unnecessary and inefficient. And I need a kill switch.
My wrong tires are 175/65-14. Special-ordered for the previous owner and still the wrong size! I have them at 50 PSI. The large cracks in them keep me from going higher!
I don't brake enough to get a useful amount of regen.
I'm getting tempted to sell the IMA battery. It seems to be working flawlessly, which might be the ideal time to remove it! Plus it would more than pay for the car.