When you're getting the kind of high FE that Bassjoos does, little things like lights do make a bigger cut in FE. I notice zero difference in FE with lights on or off as well. But I do notice with the 6000 wagon, climbing this one hill on the way home from work loses me 1-1.5 mpg. The same hill with the Celeb loses me 2-2.5 mpg.
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Winter daily driver, parked most days right now
Summer daily driver
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