I TOPPED OFF my Cessna Cardinal at Newark, New Jersey, a couple years ago and asked to have my airplane topped with 100 low-lead. "I don't think we have any of that. But we have avgas?" Back when most of our GA aircraft were built, pilots were accustomed to and trained on selecting the correct grade of avgas when refueling. But for the past couple decades, that hasn't been an issue-the choice was only 100LL, what we all know as avgas.
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