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Consensus on Premium gas for Skyactiv #3565081
12/14/14 11:23 AM
12/14/14 11:23 AM
Joined: Nov 2002
Posts: 30,935
NJ
buster Offline OP
buster  Offline OP
Joined: Nov 2002
Posts: 30,935
NJ
I just refilled with Shell 93 after reading some of the threads on the Skyactiv engine and fuel type. I'm not sure I buy the idea that it helps reduce fuel dilution, but I suppose it's possible.

Is there any consensus to date that suggests it is better? Can it do any harm other than just cost you more money?

Manual says 87 or higher I believe...

Re: Consensus on Premium gas for Skyactiv [Re: buster] #3565089
12/14/14 11:28 AM
12/14/14 11:28 AM
Joined: Apr 2008
Posts: 12,988
Onondaga County
Miller88 Offline
Miller88  Offline
Joined: Apr 2008
Posts: 12,988
Onondaga County
It will cost you less money and reduce fueldilution in the oil.

Lower octane gas is more prone to detonation. To avoid pinging the engine will have to overfuel. This will hurt gas mileage and put extra fuel in the pil.

My parents switched to 91/93 on their escape gtdi. It gets significantly better economy and has more power ... which means the transmission also isn't wearing itself out by constantly shifting.

It comes down to saving something like a savings of $5 per 1000 miles for them.


Edit: had to buy a book on gdi for my father to run 91 octane in it.


18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M
Re: Consensus on Premium gas for Skyactiv [Re: buster] #3565094
12/14/14 11:34 AM
12/14/14 11:34 AM
Joined: Nov 2002
Posts: 30,935
NJ
buster Offline OP
buster  Offline OP
Joined: Nov 2002
Posts: 30,935
NJ
Thanks Miller.

Re: Consensus on Premium gas for Skyactiv [Re: buster] #3565095
12/14/14 11:35 AM
12/14/14 11:35 AM
Joined: Jul 2002
Posts: 4,549
KY
MCompact Offline
MCompact  Offline
Joined: Jul 2002
Posts: 4,549
KY
Use what the manual recommends; the whole fuel dilution "problem" is a non issue. If any car should have a problem it would be my MS3. I'm running a tune that goes very rich at full throttle to avoid knock and I have yet to receive a UOA which indicates there is any problem with fuel dilution.

And for the record, I've had 22 UOAs performed over the 146,000 miles I've owned the car...

If the Skyactiv does return better fuel economy/performance running 93 then I would consider it, but I doubt that would be the case based on Mazda's recommendation of "87 or higher" fuel.


Mine:
2014 M235i
2009 Cooper Clubman
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2015 X1 xDrive28i


Son's
2009 328i

Buy what makes you smile...
Re: Consensus on Premium gas for Skyactiv [Re: MCompact] #3565099
12/14/14 11:38 AM
12/14/14 11:38 AM
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
xxch4osxx Offline
xxch4osxx  Offline
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
Originally Posted By: MCompact
Use what the manual recommends; the whole fuel dilution "problem" is a non issue. If any car should have a problem it would be my MS3. I'm running a tune that goes very rich at full throttle to avoid knock and I have yet to receive a UOA which indicates there is any problem with fuel dilution.

And for the record, I've had 22 UOAs performed over the 146,000 miles I've owned the car...
Your MS3 doesn't have direct injection.


2015 RAM SXT Crew Cab 5.7 with 6 speed tranny.

2008 Mazda 3 GS Sport Hatchback 5sp MT (Girlfriend's car)

Re: Consensus on Premium gas for Skyactiv [Re: xxch4osxx] #3565103
12/14/14 11:41 AM
12/14/14 11:41 AM
Joined: Jul 2002
Posts: 4,549
KY
MCompact Offline
MCompact  Offline
Joined: Jul 2002
Posts: 4,549
KY
Originally Posted By: xxch4osxx
Your MS3 doesn't have direct injection.


Thanks for the heads-up!
That would be an extremely helpful observation except for the salient fact that it is 100% wrong...


Mine:
2014 M235i
2009 Cooper Clubman
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2015 X1 xDrive28i


Son's
2009 328i

Buy what makes you smile...
Re: Consensus on Premium gas for Skyactiv [Re: buster] #3565108
12/14/14 11:49 AM
12/14/14 11:49 AM
Joined: Mar 2013
Posts: 5,037
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,037
The Midwest
My wife owned a 2012 Mazda3 with the Skyactiv engine but just traded it in for an Audi A4. Her Mazda did seem to make more power on higher octane than using regular 87 octane. Or more like the engine had a better feel to it using higher octane.

Mazda supposedly told the auto press that the North American Skyactiv engines have 1 point lower compression vs Europe due to us being addicted to 87 octane. The UK Mazda3 does indeed have 1 point higher compression.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: Consensus on Premium gas for Skyactiv [Re: MCompact] #3565115
12/14/14 12:03 PM
12/14/14 12:03 PM
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
xxch4osxx Offline
xxch4osxx  Offline
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
Originally Posted By: MCompact
Originally Posted By: xxch4osxx
Your MS3 doesn't have direct injection.


Thanks for the heads-up!
That would be an extremely helpful observation except for the salient fact that it is 100% wrong...
I was under the impression that 2007 models did not have direct injection.


2015 RAM SXT Crew Cab 5.7 with 6 speed tranny.

2008 Mazda 3 GS Sport Hatchback 5sp MT (Girlfriend's car)

Re: Consensus on Premium gas for Skyactiv [Re: xxch4osxx] #3565131
12/14/14 12:20 PM
12/14/14 12:20 PM
Joined: Jul 2002
Posts: 4,549
KY
MCompact Offline
MCompact  Offline
Joined: Jul 2002
Posts: 4,549
KY
Sorry about yanking your chain. All the 2006-up turbos are DI- and there was a steep learning curve in the tuner community, a lot of ZZB(Zoom-Zoom-BOOM!) until the tuners got a handle on the new technology. A few cars are now making over 500 hp with big turbos and E85. Me, I have enough trouble putting 300 hp through the front wheels- can't imagine dealing with 200 more ponies in anything other than a straight line...


Mine:
2014 M235i
2009 Cooper Clubman
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2015 X1 xDrive28i


Son's
2009 328i

Buy what makes you smile...
Re: Consensus on Premium gas for Skyactiv [Re: MCompact] #3565140
12/14/14 12:32 PM
12/14/14 12:32 PM
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
xxch4osxx Offline
xxch4osxx  Offline
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
Originally Posted By: MCompact
Sorry about yanking your chain. All the 2006-up turbos are DI- and there was a steep learning curve in the tuner community, a lot of ZZB(Zoom-Zoom-BOOM!) until the tuners got a handle on the new technology. A few cars are now making over 500 hp with big turbos and E85. Me, I have enough trouble putting 300 hp through the front wheels- can't imagine dealing with 200 more ponies in anything other than a straight line...
Ah yes, the turbo models. Interesting to know about that! I can imagine 500hp must put alot of strain on the transmission and CV joints as well.


2015 RAM SXT Crew Cab 5.7 with 6 speed tranny.

2008 Mazda 3 GS Sport Hatchback 5sp MT (Girlfriend's car)

Re: Consensus on Premium gas for Skyactiv [Re: buster] #3565147
12/14/14 12:44 PM
12/14/14 12:44 PM
Joined: Sep 2012
Posts: 5,461
DFW
DBMaster Offline
DBMaster  Offline
Joined: Sep 2012
Posts: 5,461
DFW
I have also tried a couple of times using a few consecutive tanks of premium in my 2012 Sky. If there was any power difference I'd need a dyno because, apparently, my butt's not calibrated. I saw no benefit to the fuel economy and I guess I don't worry about fuel dilution. I've never even done a UOA in thirty years of driving.

This has to be at least the tenth thread I've seen on this topic this year. I doubt there will be any real conclusion until somebody sponsors a REAL set of valid tests and not just "it felt more powerful."

Re: Consensus on Premium gas for Skyactiv [Re: buster] #3565339
12/14/14 04:56 PM
12/14/14 04:56 PM
Joined: Nov 2002
Posts: 30,935
NJ
buster Offline OP
buster  Offline OP
Joined: Nov 2002
Posts: 30,935
NJ
I haven't noticed any power improvement. I'm curious about whether it helps fuel dilution.

Re: Consensus on Premium gas for Skyactiv [Re: buster] #3565349
12/14/14 05:12 PM
12/14/14 05:12 PM
Joined: Jan 2009
Posts: 6,521
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,521
New England
For those who run on the "+" side of 87+ AKI, why is it that you always go straight to 93 AKI?? Why not 89, 91 or 92 AKI? "Premium" for Subarus at least, is 91 AKI, though 93 does provide a noted improvement. I can't imagine running 93 in an 87+ engine.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Consensus on Premium gas for Skyactiv [Re: gathermewool] #3565477
12/14/14 07:21 PM
12/14/14 07:21 PM
Joined: Apr 2008
Posts: 12,988
Onondaga County
Miller88 Offline
Miller88  Offline
Joined: Apr 2008
Posts: 12,988
Onondaga County
Originally Posted By: gathermewool
For those who run on the "+" side of 87+ AKI, why is it that you always go straight to 93 AKI?? Why not 89, 91 or 92 AKI? "Premium" for Subarus at least, is 91 AKI, though 93 does provide a noted improvement. I can't imagine running 93 in an 87+ engine.


Depends on what is available. Sam's Club around here only has 87 and 93


18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M
Re: Consensus on Premium gas for Skyactiv [Re: buster] #3565891
12/15/14 06:43 AM
12/15/14 06:43 AM
Joined: Dec 2003
Posts: 9,929
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,929
Florida, Cape Coral
I have a 2014 CX5 and tried 91 vs 87
and kept fuel mileage records for 2 full tanks of each and any increase or decrease was buried in the variability of tank to tank values. I therefore see no reason to run higher than 87.


CX5 Touring 2.5L :-)
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