[arpad_m]

Originally Posted by KaMaRow

I have also read several places something about bleeding some line on the supercharger that cause some acceleration issues? could this be the issue?

Air trapped in the supercharger cooling circuit can cause power loss, but as Mac7504 suggested, go one step at a time with these diagnoses.

[TXCSSU]

Originally Posted by SATINSTEEL1LE

Pull the battery cable off and leave it for a few hours. Then reconnect and go rip on it. The fuel trims will learn and it will lean out and get proper gas mileage. Your baby driving is killing it. Stop that, this is not 1950 where you need to drive a car thousands of miles before you beat on it. Seat those rings and enjoy a healthy motor.

This is what I was going to suggest, also are you M6 or A10 as I haven't seen if you've already posted. I'm averaging (per the DIC) 16-ish MPG. Also, what gas station are you using, are they TopTier, are you using the best octane available? Dealerships are notorious for using the cheapest gas for that first tank, and if they filled up with the cheapest gas, you could still have horrible numbers and fuel tables that are using data from that first initial tank, which is why unplugging the battery and trying to reset the tables is a good idea.

If you're driving a manual and you say it bogs down I can see where you trying to give it more gas to keep it from bogging down would cause a spike in fuel consumption. And of course there's one last way you can confirm it's not your driving is to ask your buddy if he wants to swap cars for a few tanks. Oh and make sure to install a dash cam that records the interior before making the swap .

[KaMaRow]

Originally Posted by TXCSSU

This is what I was going to suggest, also are you M6 or A10 as I haven't seen if you've already posted. I'm averaging (per the DIC) 16-ish MPG. Also, what gas station are you using, are they TopTier, are you using the best octane available? Dealerships are notorious for using the cheapest gas for that first tank, and if they filled up with the cheapest gas, you could still have horrible numbers and fuel tables that are using data from that first initial tank, which is why unplugging the battery and trying to reset the tables is a good idea.

If you're driving a manual and you say it bogs down I can see where you trying to give it more gas to keep it from bogging down would cause a spike in fuel consumption. And of course there's one last way you can confirm it's not your driving is to ask your buddy if he wants to swap cars for a few tanks. Oh and make sure to install a dash cam that records the interior before making the swap .

My dealer let me drive them to the gas station we put BP 93 octane in. when I picked up the car it only had 4 miles on it. Both my buddies car and mine are automatics. swapping cars is no big deal for us we do it all the time no camera needed LOL. I am confused by the people saying the MPG sounds about right??? really 11 mpg on open highway driving? the car is suppose to average 16 and with 21 on open highway driving. I know those numbers are never dead on accurate but they are never 10 mpg off. and one particular test my total drive was nothing but high way with no traffic and on open flat road with no hard driving and a steady 65 mph for 53 miles. There is no way everyone is averaging 11 mpg on a drive like that. that would mean mixed with city driving everyone would be getting like 7 mpg and I know that isn't true no matter how hard you are on the car. I think they also over look that an exact same car in exact same street using exact same gas station and that is being driven like a racecar is getting double my mileage per gallon.

Im gonna try the battery thing today but honestly im not holding out hope as im the only one who has driven the car since mile 4 and its only got 423 miles on it and there has only been good 93 gas in it. unless the tables got messed up in that first 4 miles which i highly doubt.

as for break in miles not sure much is gonna change after that I mean why would it? I know they say it uses a bit more fuel during break in but 10 less miles per gallon?? my buddies is just now out of break in and his didn't get as bad as mine during break in. IM literally using twice the fuel his is and im not even getting on the gas.

[KaMaRow]

OK guys I really appreciate all the feed back. IM frustrated and sorta a blunt guy hope none of my replies sounded ungrateful

IM gonna undo battery for a bit and check with a reader just in case on obd port. ill top off with yet more 93 fuel ( we don't have 91 around here so its always 93). I got a long day of driving and will mostly be highway. Gonna let my buddy drive it for an hour or so and see. but if i average 11 or lower again and dealer cant find out whats wrong .... anyone want a gas sucking ZL1 cause its gonna just sit till my z06 gets here. Hell i averaged 27 MPG highway in my 3lt z51 c8. city was different LOL

yes i know its a gas guzzler and i was prepared for the 16 average with 13 city. but when i do long highway drives and the average is 11 that is just unacceptable because that is when it should be getting its best averages not its worse.



Ill update yall. again thanks for all the help

[arpad_m]

Good luck, hope the battery disconnect will help. Don't go full baby on that motor afterwards, as suggested.

I did the break-in based on the track prep guide, and (before the supercharger and other mods) the car achieved 31 mpg on light highway drives, then with AFM off and a supercharger (similar setup to a ZL1) it gave me 26-28 mpg the highway, and the engine consumes almost no oil at all. Of course it's worse now with all the other juicy mods (see my signature), but even with E60 I get much better gas mileage than you do.

Originally Posted by KaMaRow

I am confused by the people saying the MPG sounds about right??? really 11 mpg on open highway driving? the car is suppose to average 16 and with 21 on open highway driving. I know those numbers are never dead on accurate but they are never 10 mpg off. and one particular test my total drive was nothing but high way with no traffic and on open flat road with no hard driving and a steady 65 mph for 53 miles. There is no way everyone is averaging 11 mpg on a drive like that.

That was a joke, brother. They talked about laying into the throttle frequently and enjoying dino juice turned into freedom, mpg be damned, that's how it's "about right"

[ukester]

put a couple thousand miles on it and then get the mileage-seems like your chasing a problem that may not be there. My 2016 Z06 average 20 mpg and i did not drive it easy

[carbon fibr]

i picked up my ZLE in september and didnt notice any bad fuel mileage like that, i do know it was worse than my SS i had before. But that sounds real bad.
id say I was getting 17MPG first 1000miles, and now probably around 19-20mpg

[mariojas]

My M6 had 20-21 on highway at 80mph, 16ish on local roads. Break-in period.

[SteveV]

Yeah, 11mpg on the highway seems off.

I have 23k on my 2018 M6 now. I get 14 to and from work and 22 to 26 on the highway in 6th gear.

I would let the dealer figure it out.

[pauly1119]

Originally Posted by SteveV

Yeah, 11mpg on the highway seems off.

I have 23k on my 2018 M6 now. I get 14 to and from work and 22 to 26 on the highway in 6th gear.

I would let the dealer figure it out.

What mode do you drive it in to average 26? I’ve heard of people driving it in snow mode and getting over 20. Even if I absolutely baby it I still only average just above 14 to 15 ish. Doesn’t really seem worth the effort. All my corvettes have always been amazing on the highway with MPG. I’ve babied my Z06 and have seen in the high 20’s but again not really worth it to me. Just really did it out of curiosity. I would think during the break in period it would be a little worse. I think the ZLE might also have a different 6th gear which makes it even harder to keep the RPM’s down.

[mariojas]

Originally Posted by pauly1119

What mode do you drive it in to average 26? I’ve heard of people driving it in snow mode and getting over 20. Even if I absolutely baby it I still only average just above 14 to 15 ish. Doesn’t really seem worth the effort. All my corvettes have always been amazing on the highway with MPG. I’ve babied my Z06 and have seen in the high 20’s but again not really worth it to me. Just really did it out of curiosity. I would think during the break in period it would be a little worse. I think the ZLE might also have a different 6th gear which makes it even harder to keep the RPM’s down.

And aero...

[TXCSSU]

Originally Posted by KaMaRow

My dealer let me drive them to the gas station we put BP 93 octane in. when I picked up the car it only had 4 miles on it. Both my buddies car and mine are automatics. swapping cars is no big deal for us we do it all the time no camera needed LOL. I am confused by the people saying the MPG sounds about right??? really 11 mpg on open highway driving? the car is suppose to average 16 and with 21 on open highway driving. I know those numbers are never dead on accurate but they are never 10 mpg off. and one particular test my total drive was nothing but high way with no traffic and on open flat road with no hard driving and a steady 65 mph for 53 miles. There is no way everyone is averaging 11 mpg on a drive like that. that would mean mixed with city driving everyone would be getting like 7 mpg and I know that isn't true no matter how hard you are on the car. I think they also over look that an exact same car in exact same street using exact same gas station and that is being driven like a racecar is getting double my mileage per gallon.

Im gonna try the battery thing today but honestly im not holding out hope as im the only one who has driven the car since mile 4 and its only got 423 miles on it and there has only been good 93 gas in it. unless the tables got messed up in that first 4 miles which i highly doubt.

as for break in miles not sure much is gonna change after that I mean why would it? I know they say it uses a bit more fuel during break in but 10 less miles per gallon?? my buddies is just now out of break in and his didn't get as bad as mine during break in. IM literally using twice the fuel his is and im not even getting on the gas.

Drive side-by-side with your buddy on the highway and see what gear and engine RPM are for both. Also, make sure you're both in the same performance setting. Your buddy having the same type of car should make it easier for you to find out what's going on. If you're driving in a different mode, I can see the transmission staying in a lower gear and your RPMs sitting higher while cruising.

[BlaqWhole]

When mine was stock I was getting around 220 miles a tank but that included spirited driving. So 11.4 miles a gallon on a 19 gallon tank sounds about right. Or perhaps you think you're driving easy but actually aren't. I honestly don't think it's off. Plus those reported MPG ratings are not really legit. You can't really go by what they claim.

Try to take your mind off it. If you focus on it then it might just be that it seems worse than it is.

[Vigilante375]

Originally Posted by TXCSSU

Drive side-by-side with your buddy on the highway and see what gear and engine RPM are for both. Also, make sure you're both in the same performance setting. Your buddy having the same type of car should make it easier for you to find out what's going on. If you're driving in a different mode, I can see the transmission staying in a lower gear and your RPMs sitting higher while cruising.

If you're just cruising down the road at a steady speed or just driving normally, you can be in Tour, Sport or Track and the car will shift the same and keep the same RPMs.

If your start to drive aggressively or so, then the car will shift differently.

Snow/Ice mode limits your throttle input and the way the car shifts so that is more smooth and not jarring the car. No matter if you're driving like old people on Sunday or if you're on a road course.

That's for the A10.