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3 inches in 4th gear is close to best BFSC. That's also a good reading for your pulse, but 2 would be slightly better.
DFCO can be easily detected, just let her slow down in 3rd gear (clutch out if manual, foot off the gas) and watch the gauge. If you feel a surge at around 1000 RPM and the car stops slowing down as quickly then you have just experienced the effects of DFCO, which ended when you felt the surge. Your vacuum will drop significantly when you feel the surge, which is fuel delivery.
You will find that 2 inches for acceleration is an excellent way to maximise your mileage, and yes, that reading can be achieved sometimes without a lot of throttle application.
regards
Mech
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