The spedo reading at both of those isn't too bad. I just checked an online calculator and at 75mph, the 245/40/18 at ~72.3mph and 235/40/18 at ~73.3mph.
But, the STi spedo is about 5mph high.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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