My beat was using oil at a similiar rate, part of the reason that my engine was planned to come apart over the winter, mainly for valve stem oil seals and piston rings. (except its now apart early for other reasons)
I did notice quite a lot of oil had gone via the breather pipe into the air filter housing, not sure if this could have been due to high crank case presure due to worn rings/glazed bores.
I was using 10W-40 GTX Magnatec and previous to that Mobil Super S 10W-40, This is the oil we use at work on nearly all Honda Models.
My beat has 80k Kms on it
HTH
Steve M
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Its all gone Norfolk!!!
Now in the Lotus position.