Here again, I uses a TI-84+ calculator to plot the bivariate data into a scatter plot. The plot seemed linear, so I performed a linear regession analysis and came up with this equation:

with a correlation coefficient of.9854

When x=180, y= -7.2 (already empty)

As near as I can tell, the cylinder went empty somewhere between 126 seconds and 127 seconds.

Ignore this post. Read the next one!