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ConnClark gives some good advice.
With respect to the muffler, if your car is a turbo diesel then remove the muffler, I did on mine, the turbo reduces a lot of noise by itself.
I run diesel conditioner in every tank. I do it for lubricity and water control but the extra cetane will boost MPG slightly.
My truck shuts off the fuel when decelerating in gear, if your car does that there may be times that in gear decel is better than clutch in coasting.
A synthetic oil like a 5w40 will do better than a 15w40 depending what your car takes, especially if you do more short trips.
A performance chip will give you a small increase as well if it is available for your car.
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