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Uh, I'd say just don't worry about it, why not press the gas on the Corolla harder so you maintain speed (unless you're trying to slow down)? 75% load or 80% load is probably almost just as efficient if not more than 70%. On the Subie, why would you bleed speed if you don't have to? You can always coast down the hill. If you want to bleed speed just push in the clutch like other people said. Oh I guess you have an auto, go to neutral then? Or just don't slow down until you're over the hill.
The inefficient nature of the typical gasoline engine means that you have to really drastically change the load to see a large efficiency difference. Above 60% load there's not that much gain to be had. Avoiding sub 50% load where you can is the best way to save fuel because that's where the engine starts to get thirstier and thirstier per unit energy produced.
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