Ixtoc
Take the middle figure, 20,000 bbl/day. In one month, 600,000 bbl. In nine months, 5,400,000 bbl.X42= 226,800,000 gallons US.
In other words, 140 million gallons may be a low side estimate.

For Macondo, estimates range between 30,000-60,000 bbl/day, middle figure 45,000 bbl/day or 1,350,000 bbl/month, thus flow rate more than twice Iztoc.
When will the well be killed? Most optimistic guess is mid-August.
What will be the total captured in the meantime?
How much will that leave uncaught?

Regardless, it's going to be a long-term disaster.