math to calculate mpg from injector pulse width

[EH3]

i'm making some assumptions with this math. can anyone here confirm if what i'm coming up with is accurate or if my assumptions are correct?

this is specific to honda/acura OBD1 ecus


for this example:
rpm=3250
mph=59
pulse width as taken from ECU map based on load=.127ms=.000127sec
injectors= 240cc
1cc=.000264gal


my major assumption is that injectors pulse once per revolution. is that correct?


so, here we go:

cc/pulse=.03048
gal/pulse=.00000805196
gal/min=.026168
gal/mile=.0257327
mile/gal=38.86


based on the reverse math from known mpg based on my weekly fill-ups, the gal/mile calc above is spot on.


i'd like to use the above logic to request a change to FreeLog (popular honda tuning datalogging software). if the math is right and accurate, a free OBD1 honda realtime MPG display could be developed within freelog.