But in the Club Newsletter with the article about fuel sticks (attached in the other thread from John), at the end of Page 7 it said "What about using a 152 FuelHawk tube on a Cessna 150? Ironically, the 152 FuelHawk is more precise on a 150 than it is on a 152", along with a table of data to back up that statement. So, one could use the 152 Fuel Hawk stick on a 150 with fairly accurate results.
I’ve been using the aluminum club fuel stick on my 150 with standard tanks, and just subtracting one gal off whatever number I measure, and it equates quite well to usable, since full-to-the-neck is 11.25 usable in a (typical) 150. I guess I could use the normal numbers and then subtract at the end, but my caveman brain likes to do the hard part first.