First off, I have never owned a Volvo and have never owned a vehicle that has a turbo in it. My wife is intent on driving the 2006 S40 T5 as oppose to the 2.4i.<p>First question would be, do you have to run premium grade fuel in the T5 or can you just run 87 octane?<p>Next.. What kind of gas mileage should I expect to get from this vehicle. My wife will be the primary driver and will be traveling 80 miles round trip per day with 75 of those miles being interstate. <p>I guess I should appologize for these "amatuer" questions but I figured this would be the place to get some answers. Thanks in advance for any responses.