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First: get a ScanGauge. It'll pay for itself many times over if you're serious about saving fuel. And with a thirsty vehicle like yours, the payback will be fast.
As for drafting: just chill out and drive slower, if traffic permits. I'd never recommend drafting, mainly for safety reasons. But in addition to that, the rigs never keep a constant speed, and you'll find you have to hunting your speed up & down to stay with one.
On top of that, another good highway technique is "driving with load" (DWL) on inclines/descents. Anything you draft will almost certainly not DWL in those situations, so even in a draft, you're giving away potential fuel savings there.
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