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You need at least three measurements for a BSFC map. Power (or torque), fuel consumption, and RPM.
Fuel consumption can be quite well approximated by the amount of time the injectors are open.
RPM can be derived from how often a given injector opens. Or, assuming you're only in one gear, from vehicle road speed.
Power or torque can be very roughly approximated by the injector duty cycle, but it would be exceedingly rough and would probably match almost 1:1 with fuel consumption.
Even if you can directly measure all of those things, you would need to spend a whole lot of time driving in order to get reasonable data for a good map. You'd have to drive at pretty much every torque level possible in every RPM, and log consumption at each. And ideally, you'd want a large number of samples at each torque/RPM point, to help average out any measurement errors.
Lots of work. The data will be very nice to have if you get it, though!!
-soD
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