zee_german, welcome to the forum...
I have 2006 3.0si and I frequently do a 100 mile round trip on weekend to the Pocono Mountains and driving the speed limit which is 65 MPH on the turnpike using cruise control. I will get about 38 US miles per gallon for the round trip. I think everything considered that is excellent....

I have 2006 3.0si and I frequently do a 100 mile round trip on weekend to the Pocono Mountains and driving the speed limit which is 65 MPH on the turnpike using cruise control. I will get about 38 US miles per gallon for the round trip. I think everything considered that is excellent....