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I find my best improvements came when I learned about backing off the throttle occasionally. I find I can back off, then reapply throttle to almost the same level... never drop any miles per hour, yet my instant MPG guage gains a bar or two. I do this once a minute or so (don't even think about it anymore... I just seem to do it!) and it keeps the MPG meter up higher. I don't know why this works... perhaps it's forcing the IMA to pump a little more energy from the battery and a little less from the ICE.
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I do this going up hills. What it does is it forces the CVT to shift the ratio sooner, which in some situations has the effect of increasing the IMA assist (if it shifts up, the the IMA must do more work to keep the engine from lugging). However, I usually use the method to reduce IMA use going up hills, to save the battery capacity for later, doing so will cause the CVT to shift to a lower ratio rather than increase the IMA as I approach a hill.