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I don't have an IS but I used to love those late night drives as well. If I couldn't sleep at 1-2AM I would just take the car down the highway for an hour. It just doesn't happen as often now with gas prices the way they are. And getting 10-13mpg doesn't help either but at least I have 500-600hp to show for my **** poor gas mileage...and yes I could be a little lighter on the throttle, but wheres the fun in that