I concur with the previous posts - pilot logbook is brakes to brakes, whereas aircraft logbook is airborne to touchdown.
Despite the earlier comment, the regulations clearly state that you should log brakes off to brakes on when you "intend" to go flying. Thus, taxying to the fuel pumps is not loggable, but if you taxy to the hold, find a fault, and taxy all the way back, that can quite clearly be logged since you were planning on flying.
When you get to more complex aircraft, it doesn't even feel like cheating to log all that time. In a multi-engine antique piston aircraft type conversion course, by the time you've made it to the hold-short line, the lesson is pretty much finished!
And a final point - if you want cheap hours building, find an airplane where rental charge is for airborne time only, and fly it to a HUGE airport, land, and taxi to the ramp. You'll easily put 20 minutes taxy in, then 20 minutes taxi back out, in the logbook.
