When Gas Is .22 Cents A Gallon Because Of A Mistake – What Would You Do?

If you came upon a gas station and saw that there was a mistake in the price, what would you do?
Here is the situation.

You notice while your about to gas up that someone made a mistake and instead of 2.29 a gallon it's .229. Yep 22 cents.
Do you

A) Do you FILL up, then leave.
B) DO you FILL up, then tell the CASHIER inside
C) DO you FILL up, and Call everyone you know.
D) DO you NOT fill up and Tell Cashier.

True story.....lol Filled up for $3 dollars.