Does anyone know of a good log book. I dont want to spend a lot of money hopefully none at all. I made my own last year and it worked pretty well but I would like something that i know will help me out.
Of the following items on a log chart what do you guys think have no bareing on my ET and which have the greatest effect.

wind (direction and speed)
Barometer
air temp
ground temp
sky (overcast, sunny)
tire temperature
amount of gas in tank
engine temp
time of day (morning, day, night)
time since last oil change
miles since last air filter cleaning

let me know what you guys think and if you have any other important things that need to be recorded let me know.