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If you can get a dyno graph for your car (search online, use gtech or similar device, or dyno) you should be able to tell when you achieve maximum torque. At WOT plus at peak torque is going to be where your optimal BSFC is. With the dynometer graph of torque you can see what rpms you should be keeping the engine in for peak efficiency (still in WOT). I did this with the Paseo recently and it seemed to return roughly 4% increase in fuel economy (48 to 50 mpg). In my case I actually had to increase the rpm range in which I had been driving.
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