Difficulty getting Physics of 2D tutorial right

Hi there…
I was messing around with the 2D tutorial of the latest version, and then, after studying it a little, I decided to make a new project, with only a character and a floor.
I’ve used the same values for my new character as the ones used in the potato hero of the tutorial (and same script).
Only difference is that I’m using different sprites.
Everything’s apparently the same, but my character jumps like… twice the distance as the potato hero does.
I was wondering if anyone had the same issue already, and what can I be missing here?
Thanks.

P.S: Sorry if this is little information… I’ll try to supply further information with answers.

Update: So, I’ve found out what was going on, altough I’m still confused.
In the 2D tutorial, going to Edit->Project Settings->Physics 2D, I’ve found out the gravity (which I didn’t alter) was -30 in Y axis (0 in X axis).
The default gravity for a new 2d project, however, is -9.8.
I’ve seen in another thread a fellow suggesting using gravity -9.8 and “mass” and “gravity scale” of 1 (as I was using, with my character reaching REALLY high).
My question now is: isn’t this odd? Is the real value of the 2D tutorial gravity of -30 and “mass” and “gravity scale” of 1, or is it just mine? Should I start adopting these values, since -9.8, 1 and 1 just makes my character rocket into the skies?
Thanks