Here in Michigan, you'll get run over driving 55 MPH on a road with a posted 55 MPH speed limit. I drive these at 62 MPH (I normally drive 7 MPH over)and generally get a line up of cars behind me. On the I-75 expressway it is posted at 70 MPH. Most drive between 80 & 85. I make sales calls with one of my business associates and he normally drives the expressway between 85 & 90. Last week we got up to 105 and 110 for passing several times.

Back in the old days with the 55 MPH speed limits, I drove out West several times. That takes a long, long time.

I don't follow Murf's thinking about not getting the fuel savings when talking about MPG. I follow the GPH in air travel but also realize wind speed and direction is a big factor.

With regard to MPG, you will still achieve the fuel economy even if it takes you longer to get to a destination. Most vehicles with an automatic transmission go through a "Lock-up" stage where the torque converter is more positive. At that speed and above, you achieve better fuel economy until wind velocity drag reduces it. Lock-up on most is about 62 MPH if I remember correctly.

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