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Sorry should have been a little clearer on that. The scangauge reported my fuel economy at ~40.5MPG, but the actual calculation showed 37.4MPG (~7.5% less). Which to me points to that big downhill as maybe the car was actually burning fuel (and that is why the temp stayed up). Although, the gauge was reading 9999MPG the whole way down. I am just trying to figure out why the temp stayed high and the MPG was off for that particular tank. Will be repeating the trip this weekend.
For the record, the fuel fill-up was normal. The tank after was back to 40+MPG. If I had overfilled the tank (resulting in the lower MPG on that fill), then I would have expected a 7-8% higher MPG on the tank after.
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