normal or acceptable oil consumption?

[Gaz64]

ALL four strokes will use all, period.

Oil control rings "control" or limit the amount of oil that gets to the compression rings.

Any engine that uses no oil is wearing the top of the bore with a taper and it will be an oil burner eventually.

The larger the engine is, or more horsepower it produces; the more the consumption.

Generally, the dipstick could show no usage, but only because the oil is being topped up with hydrocarbons and acids from combustion.

Some people only complain about consumption after a good highway run, they've simply burnt off the "topup" from the raised oil temperature.

Oil analysis would reveal the levels of byproducts added to the oil.