The publisher likely had a hand in the naming of the two books. The content is different between the two and it is worth purchasing both, though the Hartman is better from a technical standpoint.I searched the thread to find the two books you recommended. They are:
'How to Tune and Modify Automotive Engine Management Systems' by Jeff Hartman
'How to Tune and Modify Motorcycle Engine Management Systems' by Tracy Martin
Very interesting that the titles are so similar yet from two different people. I will check them out. Thank you.
Also - if you don't care about fuel economy, just run an open loop tune and remove the O2 sensor.