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It's well known that you get worse gas mileage with cruise control on, as much as 5mpg worse. This is because cruise control doesn't deal with hills in an efficient manner (by slowing down, downshifting, etc for less throttle and less revs). I notice this every time I drive my truck with cruise on... it just sits there at full throttle to gain another 3mph, sucking gas like whoa.
When you drive as much for work as I do, you keep good track of this shit.
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