What type of fuel is best for a 1997 Ford Explorer?

Exactly the octane the engine was designed to run on. If your owners manual says, 87 octane, then use 87 octane. If it says 89 then use 89. The use of a higher octane than the engine was designed to use is a waste of money, and will provide no benefit whatsoever. No better mileage, no more power,...

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What were olden day ferries used for?

For moving men, horses, and goods across a body of water when it is a significantly shorter route or when the water is too deep for crossing on foot.

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