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Hi lamebums, if I were you, I'd recommend this simple experiment: at the end of a trip with a hot engine, idle while monitoring the coolant temp via the ScanGauge until you hear the cooling fan start up.
Yes I know it's sacrilege for a hypermiler to idle, but consider the overall goal...
You'll then have a known point to use to decide how much grille blocking you can reasonably use given your driving conditions (hills).
The alternative - and the best of both worlds, really - is a block that's adjustable from the cabin. Imagine the benefit if you could run fully closed until up to temp, and then open as needed...
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