To get my numbers, I generally try to keep my RPM below ~2200 when accelerating, and above ~1200 when cruising. E.g. I can cruise in 5th at 30mph, but I find I get slightly better economy in 4th until ~35. I avoid using assist unless it can prevent the need of downshifting out of my ideal rev range. There's some debate as to whether cruising in 4th in lean burn is better than 5th in stoich when you're in that area where you need slightly more power than 5th can deliver in lean, but my experience has been that it's (marginally) better to keep the revs lower. YMMV.
The only time I really use my kill switch is when my battery is >75% and when there's a hill whose slope is just right for maintaining speed in neutral, and I'd lose speed if engine braking, but I use my regen button a lot. If you can keep your battery above a certain level (~75-80%?) it seems like there's no background charging and mileage improves.
Other than that, just normal driving techniques; conserve momentum, keep the A/C off, look ahead.
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