The 4.8is is the same way. I prefer driving in Sport mode as well except in stop and go traffic. You will hold lower gear revs higher and it can get a little choppy because you are going in between gears a lot on speeding up and down with traffic.

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Jeff
Current:
'07 Jeep Wrangler
'06 BMW X5 3.0i

Former:
'12 WRX; '08 WRX; '06 BMW X5 4.8is Dinan S1; '02 BMW 530i Dinan S2