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I've also heard a rumble, but I attribute this to the changing revs of the engine. It could also be the generator. It only happens when the battery is completely depleted. It doesn't happen when you engage Sport Mode when the battery is still full or half full.

So if you're going on a long trip (on which you know you're going to have to use Sport Mode) and you want to avoid engine rumble, you simply engage Sport Mode when the battery still has charge left.

I've driven 750 kms (470 miles) so far and used 25 liters of gasoline (6.25 gallons), so I am getting 75 miles to the gallon. I think this will improve when it gets warmer and the range on my daily commute improves.
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