I know some of you guys don't surf the miataforum so here. This article shows the BSFC plots of an engine before and after turbo: http://www.tc.gc.ca/programs/environment/climatechange/subgroups1/vehicle_technology/study2/Final_report/image/Final_30.gif
Here's the specific graph: http://www.tc.gc.ca/programs/environment/climatechange/subgroups1/vehicle_technology/study2/Final_report/image/Final_30.gif On a slightly different topic, the BMW 335i offers very good MPG for the car's power and weight. One strategy they have is that the wastegate is open during cruise. This would presumably reduce backpressure and thus reduce "blowdown" losses during the exhaust stroke. I've always advocated using a large-diameter, low-PSI wastegate can, and using TPS-controlled EBC, for driveability. One downside is that tuning boost control will be tricker.
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