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It's not 90-100 mph. but I'm getting low 60's mpg on 80mph interstate trips, 80mph being as fast as I wanted to go on a continuous basis on a 70mph PSL interstate. I've done some short 90-95mph runs to test the upper limits of lean burn in my car (I didn't reach the max lean burn speed), but since my max lean burn throttle setting of 6.0usec at 65mph gives me about 50mpg, the 4.5usec throttle it took to maintain 93mph should be getting better than 50mpg.
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