I use 93 octane (Mostly non-TopTier now since I work from home now and there are no TopTier stations around my home) and I average about 22mpg - mostly 35-45mph country roads with very little highway driving. I have VERY little oil consumption and VERY little oil in my intake tube when I check it. I honestly think that the more "aggressive" that you drive, the more oil will end up in the intake due to increased vacuum because of heavy throttle. No evidence to support that - just makes sense to me.
50k miles on my 2012 LT - purchased with 19k miles. Engine power and gas mileage are the same as when I bought the car.
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I don't know this for sure so don't hold me to it. But I disagree on the aggressive driving and oil consumption. I say this only because according to my scan tool data the highest vacuum pressure or air pressure getting sucked through the intake are at lower RPM, using that logic it would speed the oil consumption and draw more oil into the engine. Like I said this is just a half educated guess. At idle I will show about 8psi but at 3,000 rpm it will be 1 or 2 psi.
I do agree with you in the other post that someone asked about the valve coking problem that it all depends on the specific car. I think you got lucky and aren't experiencing any of the problems others are who have excessive oil consumption. My question is what's different about each engine that makes some of them ok and others develop a serious problem? They're identical in every way. The only thing I can think of is I drilled the holes on the dirty side of the pcv barb slightly larger, another forum member posted a thread about the factory holes being too small and getting clogged. But I don't see how that could cause this kind of problem.
I did some math and a cold check of my oil to get the most accurate reading. I figured in 375 miles 3 ounces of oil just disappeared, I know it's in the pcv system and intake somewhere. I know this doesn't sound like much but figure that's 16 ounces in 2000 miles, that's 2 cups of oil dumped right into the engine. Yes a catch can is the answer but then the powertrain warranty becomes a problem. I know it's a rock and a hard place and there's not a whole lot that can be done. Even induction services aren't good because they can break carbon off and scar cylinder walls.
My next battle is to deal with Chevy, I've had good luck because I've been a GM owner my whole life and my parents business has several GM vehicles. I'm going to see if through them I can get my valves manually cleaned, or at least get the dealership to take a serious look at things. They tend to take the lazy way out, if there's no check engine light they will say they can't duplicate your issue, which is their favorite saying. I may try one more seafoam service myself now that I've got a way of getting it into the TB.