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Most of the fuel my cobalt burns is during the first 5 minutes, I spend the next 1.5 hours catching up. How you drive the first 5 miles has more of an effect than how you drive the next 30, because FE is weighted moreso by bad FE (even short durations) than good FE. AKA it takes a lot of "good" driving to make up for a little bad driving.
Around here I can usually hypermile a lot during warmup so it has less effect (I doubt my car really warmsup on my daily trip)
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