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post #16 of (permalink) Old 01-07-2017, 07:57 AM
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When I say "vacuum", maybe I'm using the wrong term. But what I mean is that when you are full throttle, surely there is more "suction" at the throttle body opening than there is under light throttle? I mean way more air is being sucked in, so I would think that there is a better chance of oil to be sucked in as well?

Like I said, I have no evidence this is try, just seems to make sense to me...

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post #17 of (permalink) Old 01-07-2017, 08:16 AM
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Vacuum (which operates the pcv) is at its lowest during wot due to the open throttle plate. Vac. is at its highest during deceleration due to the closed throttle plate and still elevated rpms. To determine a healthy engine using a vac. pressure gauge you want to see ~20 in. mercury @ idle at normal operating temp. A/c engagement will lower the reading. Another good test is the snap throttle. At idle, rev eng. momentarily and vac. gauge should nosedive to ~0, then spring back up to ~25 and settle back down to ~20. For other gauge scenarios/readings, there are vac. charts all over the web with symptoms/causes. The simple vac. gauge is becoming a lost art in determining eng. health....

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post #18 of (permalink) Old 01-11-2017, 07:28 AM
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Quote:
Originally Posted by kb3gup View Post
Hey guys,

Just wondering what kind of gas mileage are you getting in your 8th gens? With stock tune? And if you're running top tier gas? And any other considerations like excessive oil consumption (some cars seem to really drink the oil through the PCV and back through the intake and some don't at all thus don't experience the carbon issues and reduced gas mileage like other do). Also if you mostly if you do city or highway driving. I'm getting about 16 town 20 highway top tier 93 octane which is up a few miles after replacing the evap purge solenoid and the canister vent solenoid which were both bad. Mine drinks a lot of oil and I'm wondering if my mileage has decreased enough that I can get the dealer to do a manual cleaning of the valves under the powertrain warranty. The normal $100 deposit won't cover them telling you whether or not it will, so I'm fishing for evidence. Thanks!
My 2016 is running the stock tune, and I've been averaging 24 mpg running Tier 1 (mostly Chevron; some Shell) regular 87. This is with 80% freeway and 20% surface street driving, but my freeway drives are almost all during rush traffic, with lots of stop-and-go / creep-and-beep going on. I've been very happy about this mileage, because the car that the Impala replaced never returned better than 22 mpg with exactly the same usage on the same roads, despite the old car being a couple hundred pounds lighter and having a much smaller motor with far less power.

I have put about 1500 miles on the Impala since buying it and have not noticed any oil usage. I have not yet changed the oil from whatever was in there when I bought the car, but will be putting Mobil 1 5W30 in the crankcase when I do.

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post #19 of (permalink) Old 01-22-2017, 09:08 AM
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Stock 2013 LTZ, 24.3mpg average on 91 after resetting it two tank fills ago. About half freeway (300 mile trip) and city.
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post #20 of (permalink) Old 01-23-2017, 08:46 AM
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Quote:
Originally Posted by kb3gup View Post
Hey guys,

Just wondering what kind of gas mileage are you getting in your 8th gens? With stock tune? And if you're running top tier gas? And any other considerations like excessive oil consumption (some cars seem to really drink the oil through the PCV and back through the intake and some don't at all thus don't experience the carbon issues and reduced gas mileage like other do). Also if you mostly if you do city or highway driving. I'm getting about 16 town 20 highway top tier 93 octane which is up a few miles after replacing the evap purge solenoid and the canister vent solenoid which were both bad. Mine drinks a lot of oil and I'm wondering if my mileage has decreased enough that I can get the dealer to do a manual cleaning of the valves under the powertrain warranty. The normal $100 deposit won't cover them telling you whether or not it will, so I'm fishing for evidence. Thanks!
I have an 08 LTZ, 3.9 LZG AFM. Stock tune... for now

I am getting about 17 average city, and (depending on speed and other factors) 25 - 30 highway. I took a 250 mile road trip a couple months ago and got an average of 29.5 mpg, and my instant (take from that what you will) was 31 mpg. I was so impressed / shocked I took pictures lol. I'm running top tier 87 octane.

I haven't noticed any excessive oil loss. I have noticed a vibration at 45mph in 3cyl mode under light acceleration, but that's me digressing.


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post #21 of (permalink) Old 01-24-2017, 07:22 AM
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I am hitting 28ish on the highway... Mostly highway commute... Roughly 425-450 miles to the tank before I fill it. I am a little disappointed with the 28, but it is winter and I am assuming Missouri uses winter blended fuel which should explain some of it. The speed limit is 70 and I set the cruise between 65 and 70. I use Phillips 66 87 octane which is listed as a top tier fuel. Car has close to 35,000 miles on it, put in service Sept of 2013. Stock tune and zero engine or transmission mods. I was expecting this car to run 32ish and maybe that will be possible with non winter fuel.

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post #22 of (permalink) Old 01-29-2017, 09:02 AM
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2008 LT 3.5L averaged 29mpg when new (1/2 HW and + 1/2 state roads with some lights) and slowly down to 28mpg (3 years ago) and 26 (1.5 year ago). Now it is 25mpg (more local dropoff+pickup trips with 2 kids in school)...

2017 LT 3.6L brand new. just refilled last night the 1st time. DIC averaged=24mpg. I am not looking to get better mileage otherwise I would have bought a Malibu instead.
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post #23 of (permalink) Old 02-09-2017, 04:47 AM
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Bone stock 2013 9c3 with 108k. Burns no oil whatsoever, at 70 mph I average 29-32mpg, on my 45 mile one way work commute on 55mph hilly back roads with plenty of idling time to warm up, 6 miles of stop and go, and fairly agressive throttle I'll average 25-26.
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post #24 of (permalink) Old 02-18-2017, 07:18 AM
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Get better than 30 highway from our 12 lt if we keep it under 77, after 77 on the highway it falls off pretty quick. I seem to get better mpg than my wife when I get to drive the car, which is not too often. Average mpg has been 26.4, that with 3 to 4 days a week of sitting in school lines at 3 schools to pick up kids, good bit of stop and go. Car had 110,000 on it last week, wife drives it daily.

Most often use sams club or walmart gas, murphy oil 87 octane. Car has never had e85 in it.
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