I've posted here regularly about the implications of
mean reversion in elevated profit margins (see, for example, The Temptation
To Abandon Proven Models In Speculative and Fearful Markets: Why This Time Isn't Different, What Record Corporate Profit Margins
Imply For Future Profitability and The Stock Market, Warren Buffett, Jeremy Grantham, and John Hussman on Profit, GDP and Competition).
If you normalise the fuel margins the
implied multiple can start
to look less attractive, and
to the extent the market does not expect
mean reversion in terms of fuel margins this could lead
to a nasty surprise.
Of course, it does
imply mean reversion & economic flexibility — so you always want
to watch out for the exception: A secular / permanent step - change in a country's circumstances, and / or an inability
to adjust
to changing circumstances.