Grp. with clout at the gas pump

This time we are looking on the crossword clue for: Grp. with clout at the gas pump.
it’s A 31 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: OPEC.

Random information on the term “OPEC”:

This is a list of groupings of countries or of intergovernmental organisations, formal or informal, organisational or economic category.

OPEC on Wikipedia