"I have corrected the sequential decreases in cost per gallon: "
Those are not sequential periods and there's no way to mathematically conclude that, just because FY 2012 was less than Q1 2012, each of quarters 2, 3 and 4 showed sequential decreases or, in fact, decreases at all. All we can mathematically conclude is that ONE of those three quarters had a calculated cost that was less than $2.09. There's no way to be certain that Q4's cost was higher than Q1 2013 and the cost change between those 2 quarters could indeed have been an increase. Come to think of it, there could have been cost increases from one quarter to the next at any point or points from Q1 2012 to Q1 2013.
Elementary math does not support your contention that there were sequential decreases. Hopefully management recognizes at this point how foolish it was to leave that data out of its quarterly reporting.....although I guess it served their purposes at the time.
"What do you think the cost will be for Q2 2013? "
I don't think that the company's calculated cost per gallon figures should be relied upon. Accordingly, I have no guess......they'll report (or not report) whatever they choose, with or without explanation.