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Oil bath air filters are very effective. I've yet to see data that shows filter restriction affects fuel mileage on a diesel.
Perhaps you can decrease your rolling resistance by making sure your wheelbearings are well lubricated, and gets some good slippery synthetic lube in your transmission and differentials. Make sure your brakes aren't dragging. Get your operating temperature up to 190F, turn your fuel down if the engine smokes, get some biodiesel in the fuel tank for lubricity and improved cetane.
Those are the only suggestions I've got.
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I'm not coasting, I'm shifting slowly.
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