Jay Honeck wrote:

I log the following:
Hobbs start/Hobbs stop
Tach start/Tach stop
Clock start/Clock stop
Wheels off/Wheels on

Why do you log four different times? And *where* do you log them?

I rent, so the airplanes have different setups.
The Champ has no electrical system, so I have Tach time. Depending on
how "fast" (that's a relative term) or slow I fly, the clock time may be
greater or less than the tach.
On other aircraft with electrical systems, a Hobbs and a Tach, the time
will varyfor several reasons.
For example, the Hobbs on the Cherokee Six is tied to the oil pressure
switch. Until the Tachometer gets above 1600 RPM, the Hobbs doesn't
move.
By recording Clock start/Clock stop, I have a true reference to Hobbs
and Tach.
By recording Wheels off/Wheels on, I have an accurate measure of actual
flight time.
What goes in the logbook is the greater of the three.
I have made my own logging cards (5x8 blank index). I have also included
blocks for logging fuel used from each tank to maintain fuel load
balance and compare to the totalizer. The Cherokee Six and Bonanza have
four tanks, do I included blocks for each.
The logging card has space for five legs on each side. I have a
four-hold punch for flip plates. I include logging cards with each
aircraft checklist.

The following block titles are used:
DATE
AIRCRAFT N-NUMBER
DEPARTURE AIRPORT
DESTINATION AIRPORT
TACH START
TACH STOP
TACH FLIGHT
HOBBS START
HOBBS STOP
HOBBS FLIGHT
CLOCK START
CLOCK STOP
CLOCK FLIGHT
WHEELS OFF
WHEELS OFF
BLOCK TIME
RIGHT TIP
RIGHT MAIN
LEFT MAIN LEFT TIP