I just wanted to add some data. According to one of the old brochures, a 760 turbo gets 38 mpg at 56 mph in overdrive. I wanted to see how well I'd do with my less efficient N/A 740. I kept my speed between 55 and 60 and over 140 miles I got 32 mpg. Also my overdrive did not work which accounts for some of the difference.
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