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Well, I got 31.24mpg from the 550hp LS1 on a trip under perfect conditions but no hyper milling. Averaged 100kph (62mph).
Sadly that is imperial mpg, so that translates to 26mpg US or 9.09L/100km. Still not as good as the stock cam but I am yet to install the new state of art Bosch EV14 injectors which should gain another 3-4% over the bored out crappy injectors I am now using as there are several areas where the tune can be improved with better injectors.
We are getting there :-)
It's not bad for a 4000lb 4 door sedan with auto. Figures are no BS dash reading, these are actual kms and actual fuel used topping up by sight to ensure same level at each fill up.
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