IPM's Attack Range

#1
I found this information somewhere its not mines. But is it true that the range (in number of systems) of an IPM is determined by the Impulse Engine level:

Range = (5 x Impulse Engine Level) - 1

So does that mean Impulse Drive level 5 would give (5*5 - 1) = 24 systems, meaning if my colony is at 1:50 I could hit anywhere between 1:26 and 1:74?

Thanks
cron