Mario (without Super Mushroom) is 4'5".
Mario (with Super Mushroom) is around 5'.
That's why in the 3D games, he's shorter than Peach, and in the 2D games when he's normal Mario, he's shorter than Peach.
I guess people call him Super Mario even when he's not "Super" Mario.
Hmm. He WAS as tall as Peach in SMRPG... without a mushroom... but that explains why they list him as "Super Mario" in the intro. He's like permanently super in that game... yeah, that's why when he becomes "retro" Mario, he's in "Super" form, and if you think about it, in Paper Mario, he's short, right? And when he becomes retro Mario in that game, he's normal Mario... I'm trying to get this all straightened out in my head... so that's why I'm rambling.