Juse821 Posted May 6, 2008 Report Share Posted May 6, 2008 I let my wife drive my truck for a month while her car was in the shop. She was putting in 87 for that whole month. After about a week after she stopped driving it it gave me a check engine light. Got the code read and it was 2 o2 sensors giving the engine light. Bought some fuel injector cleaner and went and filled the tank with 91 octane. 2 days later the engine light turned off and hasnt came back since. In my opinion it makes a big difference in the performance and life of the truck. As much as it hurts to have to spend almost 4.00/gal I dont think I can do the lower octane in fear of something bad happening. Quote Link to comment Share on other sites More sharing options...
jerry7784 Posted May 6, 2008 Report Share Posted May 6, 2008 yeah i never use anything less. when i first picked up my truck i didn't notice the label on the gas door that says super unleaded only or something like that so after i got done filling up with 87 n saw that label i'll never go back to doin that super octane all the way Quote Link to comment Share on other sites More sharing options...
lilindy500 Posted May 6, 2008 Report Share Posted May 6, 2008 I have been running 87 octane for the past month since I bought the truck. 87 octane is $1.28 per liter. Costs me $120 to fill. I consistenly run 13L/100km doing 100-110km/hr. Or like 65mph for your guys. Ran 91 octane for a tank from a place that sells it alot. I have to drive 45 mins to get to 91 octane fuel that is fresh. It was $1.38 per liter. Cost me $60 for 43liters. Got 14-15L/100km. Was noticeable lower and never got any better mileage. Maybe my truck has a tune for lower octane or something? Oh well, I ordered a tune for 87 so I can be sure it will be safe running 87. I wish I was done university already to start modding this truck. But for the next 2 years it will be left as is. Quote Link to comment Share on other sites More sharing options...
agreif Posted May 8, 2008 Report Share Posted May 8, 2008 I think someone else can confirm this, but the SS's came with a dual octane tune from the factory, so if you do go to 87 or 89 it's going to sense the knock and retard everything until it's gone. You won't do damage, but like many have said here, you will lose power and may lose mileage as well. Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted May 8, 2008 Report Share Posted May 8, 2008 The stock LQ9 compression ratio is 10:1, running anything lower than 91 octane is no bueno. Quote Link to comment Share on other sites More sharing options...
56chevywagon Posted May 8, 2008 Report Share Posted May 8, 2008 I have used both 87 and 89 in my truck (before the SC) and I noticed no physical or audible difference...I will say I did notice a loss of power. I didn't notice any loss of MPG but I was also dirving it easier since I did run the lower octane...You shouldn't notice a knock or pinging since the computer makes the adjustments to compensate. Quote Link to comment Share on other sites More sharing options...
SSPOSSE Posted May 9, 2008 Report Share Posted May 9, 2008 periodically clean the MAF sensor, with MAF sensor cleaner.. noticed mine was running a little slugish and not shifting as normal..losing fuel economy also.. after it was clean it straightened right up and runs great.. gained the horse power back and fuel economy. Quote Link to comment Share on other sites More sharing options...
SS_bnoon_SS Posted May 9, 2008 Report Share Posted May 9, 2008 periodically clean the MAF sensor, with MAF sensor cleaner.. noticed mine was running a little slugish and not shifting as normal..losing fuel economy also.. after it was clean it straightened right up and runs great.. gained the horse power back and fuel economy. Especially if you run an oil type air filter (K&N, Air Hog, etc). Or you can get one of the new dry flow filters and not have to clean it nearly as often. Quote Link to comment Share on other sites More sharing options...
KJT13 Posted May 9, 2008 Report Share Posted May 9, 2008 I've never put less than 93 in mine since buying it. Quote Link to comment Share on other sites More sharing options...
04CHASE Posted May 9, 2008 Report Share Posted May 9, 2008 well it wont hurt , thats why we have knock sensors . to retard timing so the pinging wont damage your motor. our trucks come with a low and high octane timing table. one for high grade like your recommended to use and one for lower grade. if it picks up conistant knock it will go into the low octane timing table. giving you less power but less ping. so yes you can run it, i wont just becasue i want the extra power. besides gas mileage may go down a bit with lower octane due to faster burn rate and less timing=less power=takes more power to propel the dam brick. Quote Link to comment Share on other sites More sharing options...
slammedbowtie Posted May 11, 2008 Report Share Posted May 11, 2008 93 only for me!!! runs me broke, but i love the bitch. Quote Link to comment Share on other sites More sharing options...
NTMD8R_SS Posted May 11, 2008 Report Share Posted May 11, 2008 Plus i don't drive it much anymore. Quote Link to comment Share on other sites More sharing options...
payton23 Posted May 11, 2008 Report Share Posted May 11, 2008 Plus i don't drive it much anymore. been using 87 since i had it ..knocks and pings like crazy since going to 91 is a beautiful thing Quote Link to comment Share on other sites More sharing options...
vmaxman Posted May 12, 2008 Report Share Posted May 12, 2008 ive run 93 since the day ive had my truck i tried 87 one time and i could feel a difference in the performance of the truck just driving Quote Link to comment Share on other sites More sharing options...
Berry Posted May 12, 2008 Report Share Posted May 12, 2008 Nothing but 93 for her! Quote Link to comment Share on other sites More sharing options...
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