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Meh, it looks like your LOD reading isn't the % of load available at that specific rpm but rather the % of load that the engine is capable of putting out. Unfortunately, this is much less useful. I'm almost positive, but the car has a MAF not a MAP sensor, right? If it had a MAP you could use the manifold pressure as a more accurate load gauge. Otherwise a vacuum gauge does the same thing.
Anyways, as I said before, even with the really short glides, P&G is still the best technique. However, if the hill is real steep at all I'm sure just puttering along at the speed limit (or whatever) is going to load the engine up enough to put it in an good area for BSFC.
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