i have a mileage computer but still use a vacuum gage when i am adjusting the pedal because vacuum is more instantaneous. i can see how fast i am moving the pedal on the vacuum gage. And i can go right to the vacuum that i know will sustain my speed. Also when i am driving up and down hills i can see when i am going over the top better. by driving constant vacuum i can speed up going down the hills and let off going up. i can also do things like avoid downshifts and fuel enrichment. i try not to ever go to zero vacuum. because that means i have the throttle open further than the engine can take. by always showing some vacuum i can gage how fast the engine is responding.
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