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My 08 Altima peaked at 33-34 MPG using mild techniques (2.5 engine CVT 3100 pounds). Do not coast with the engine off, you will damage the CVT. Coasting with engine running is one of your best weapons.
I think you have reached a plateau and from here on the benefits will be fairly small.
I would not worry about modifications to steering and the water pump, costly and with a small benefit.
Fayette ville is hill country I believe. Hills can be an advantage if you use them properly.
With a 33 MPG highway rating you are at about 33% over Epa highway and that's pretty darn good. Lowering your average speed and anticipating any forced stops and coasting are probably already in your technique. Route strategy where you avoid heavy traffic and stay at 35-45 MPH speeds might get you a little higher, but as I said earlier I think you have reached close to your maximum potential.
The Nissan CVT seems to handle coasting and reengaging the gears well at almost any speed.
Regards
Mech
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