I have graphed my consumption figures, recorded since delivery and now pressing 1500 miles, beginning with 29.6 MPG(US). At last look, 36.2 MPG. All of the driving has been similar: inner city/some hills (no highway); A/C with recirc; 93 octane E10 from the same pump. The graph shows an increase at every fillup. The greatest increases occured during the first 300 miles of a 500 mile period when fossil oil was used (right after delivery). After 900 miles the increases continued, but at a much smaller rate, and I suspect that the majority of "break-in" had occurred by then. I may still see some improvement. I am 22% better than delivery, and 10% better than EPA City. The car is definitely more lively. I drive stick only and my wife drives rubber-shift. I did not baby the car through the first 1000 miles, but kept the engine freely turning in the 2500-4000 RPM range, with many deliberate, brisk accelerations between the two. I actually drive a little more conservatively now than during the break-in regimen. I still don't baby it; no "hypermileing" or searching for frog hairs.
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