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Engine piston geometry change had good results.
I am reworking my engine again and decided to go with a more complicated style quench/reverse step piston to improve detonation resistance and it seemed to have had a nice affect on the mpg.
Went from 10.3 mpg on winter gas to about 16.7, not exactly sure if the change was only from that or from the other things that were changed but regardless the mpg is doing much better now when my foot is out of it.
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