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i'm driving a big ass 6160 lbs Ford van with AT. For years i got 13.5 mpg using cruise control and slow acceleration. i have added a vacuum gauge and use P&G, DWL, etc. and brought the mileage up to 17.
This stuff is very counter-intuitive--it takes a real mental effort to get past the commonly-accepted folk lore of driving and vacuum gauges, such as that the vacuum must always be running high (closed throttle) to get the best fuel economy. It may be true at cruise, but it's doesn't work that way all the time.
On hills and during pulse the vacuum gauge lets me keep the maximum open throttle before reaching the point that the tranny wants to kick down to a lower gear.
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