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I have driven a chevy silverado for work, and the 4 cylinder feature nearly doubled economy. I was looking at 14 mpg in v8 mode and 30 in 4 cyl mode.
It would switch over at about 8 inches of vacuum if I remember correctly.
I was able to coax 30 mpg out of one of the chevy diesel work trucks one day as well. The guys riding with me had to pick their jaws off the floor. They made it their mission to get the lowest mileage they could from that day forward. I never saw those trucks get above 14 mpg ever again. They beat on em hard.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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