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Push is pretty much the same as bump, and as far as I can tell the concern is negligible.
However you start the engine, everything is cold upon starting. Some uncombusted fuel is going to make it through. I can't see how push starting the engine puts it into a significantly different operating paradigm than conventional starting.
Bump starting is just like push starting, except everything - including the cat - is pretty close to operating temperature. I think Ford is just hedging against possible damage claims.
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Lead or follow. Either is fine.
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