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I have a vacuum gauge on my '88 Escort. You are correct about how little you have to change the throddle opening to make a huge difference in engine vacuum. Mine reads 20-21 In/Hg at idle and on flat road which there's not much of around where I live I can keep it at 15-18 In/Hg. On smaller hills I'll usually drop to 10-15 In/Hg, on larger hills I'll drop down to 3-10 In/Hg and about 25 In/Hg during deceleration. Lots of people say they get better mileage accelerating down a hill to get momentum for the upcoming hill, but I've tried it in my car and I always do better coasting down the hill and start accelerating right at the foot of the hill before I lose any speed and momentum.
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