Give yourself enough time to:
Stay in the right lane and possibly get some drafting help from larger vehicles. Follow them with 3 stripes between you and the other vehicle. The best drafting source is a bus or a truck that has a lower rear end that is close to the road surface.
Use the cheapest gas you can buy, search the net for best prices.
A manual is not going to make a lot of difference in a higher speed commute and the autos have taller final drive ratios.
Assuming fuel prices rise as we expect the truckers will slow down some to save fuel. Do not be an obstruction to traffic but be patient and stay primarily in the right lane.
If there are hills on your commute, you can allow your car to slow down slightly on the uphills and speed up some on the downhills. The truckers know this, especially the ones who drive the best for mileage. Wal Mart truckers are like this where I live, as well as UPS big truck drivers. You may find you end up behind the same truck on almost a daily basis.
regards
Mech
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