If you switch from your OEM 165/65R14 tires to a wider
185/60R14 tire you will be very impressed with the ride quality and comfort increase.
Yes you will use about 10% more fuel, but your car will be more comfortable and safer!
I know that alot of motorcycle shocks can be adjusted to make a smooth ride. I wonder if a shock shop could rebuild the stock honda shocks to improve them? Or if bike shocks could be adapted to the Insight?
I moved to Michelin HydroEdge 185/65R14's, inflated per the door jamb pressures (to start) and the ride improved dramatically. So did the road noise and handling. Mileage went down, but after adjusting for the 4.8% decrease in indicated speed (and thus indicated mileage) I don't think it's vastly different that where I started. I'm going to guess that it's down less than 5% in real terms. Ended up with about a 1% speedometer error, reading on the low side. Original speedometer cal. did not really match the original tires.