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Couple of things. On the wheels, I think you'd have to look pretty hard to find anything lighter than what comes stock on the Insight. Oil, yes, use the 0W20: at 165K miles, I'm still seeing no use or leaks between changes.
General driving: don't be afraid to downshift on the freeway, or on hills. Generally shifting into 3rd seems to get better FE than 4th, though there are places (like those hills on 680 just before the turnoff to 580) where the best I could do was to cruise ~65-70 mph in 4th. You do need to keep the revs up for hill climbing.
Other than that, a lot of it is just learning the car.
Oh, and autostop doesn't work if you have heater or A/C on. In cold weather, part of slowing down is learning to hit the big "Off" button on the climate control panel.
And if you put in a radiator block, don't trust the temperature gauge to tell you anything useful. If you have a ScanGauge or similar, set one readout to coolant temp.
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