NashSS Posted May 11, 2007 Report Share Posted May 11, 2007 Gas is going up and I'm not wanting to pay for premium fuel for my truck. My questions is can i run 89 octane without worries or should i just suck it up and put 91 in. I usually put in 91 or 93 octane. I won't even consider 87 but i figure 89 would be ok but id rather ask than make a full tank mistake lol. Thanx Quote Link to comment Share on other sites More sharing options...
misterp Posted May 11, 2007 Report Share Posted May 11, 2007 On the stock PCM tune yes; if you have an aftermarket tune then you need to ask your tuner. Mr. P. Quote Link to comment Share on other sites More sharing options...
Jond983 Posted May 11, 2007 Report Share Posted May 11, 2007 nash you still sellin your truck? Quote Link to comment Share on other sites More sharing options...
12'SROCK Posted May 11, 2007 Report Share Posted May 11, 2007 Gas is going up and I'm not wanting to pay for premium fuel for my truck. My questions is can i run 89 octane without worries or should i just suck it up and put 91 in. I usually put in 91 or 93 octane. I won't even consider 87 but i figure 89 would be ok but id rather ask than make a full tank mistake lol. Thanx so what do you plan on buying with the +/-$8 you save from switching gas? Quote Link to comment Share on other sites More sharing options...
NashSS Posted May 11, 2007 Author Report Share Posted May 11, 2007 Im not sure but its hittin me over 80 bucks to fill her up a week. I'm still thinking about selling my truck if someone is intersted in it im willing to work the price to someones liking but i do have a limit that i will not disclose because i still owe on the truck. Quote Link to comment Share on other sites More sharing options...
Quik Posted May 11, 2007 Report Share Posted May 11, 2007 its not even worth chancing the motor with lower octane. if you can afford 93 octane might as well get rid of truck. cause the difference is only around 5 bucks for a full tank Quote Link to comment Share on other sites More sharing options...
NashSS Posted May 12, 2007 Author Report Share Posted May 12, 2007 I was just curious because its just cheaper, I can afford the 93 octane but i was just wondering. Quote Link to comment Share on other sites More sharing options...
Prestoar Posted May 12, 2007 Report Share Posted May 12, 2007 I have always heard the mid range octane is actually better because the higher octane is not used much and usually old and just not as good..it just sits in the tanks and no telling whats in some of those tanks..i wear gloves and air mask when going in the bathrooms Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted May 12, 2007 Report Share Posted May 12, 2007 lower octane fuel The LQ9 in our SSSs have 10:1 compression, running anything lower than 91 is stupid. Lower octane = detonation and pinging = knock retard = lower fuel economy and less power Quote Link to comment Share on other sites More sharing options...
n2opwr Posted May 13, 2007 Report Share Posted May 13, 2007 I ran 87 in my truck for about 2 years until I put a whipple on it, now all I run is 93 octane. It would spark knock with the 87 octane under hard acceleration or with a load. Under normal driving conditions, the computer would pull enough timing and it never really pinged. I would fill it up with 93 octane if I knew I was going to the track or if I was planning on pulling a trailer. I can tell you one thing, the difference between the two fuels is huge. I ran my buddy's completely bone stock SS with 93 octane against my truck with 87 octane, a CAI, Cat-Back, E-Fans, Throttle Body Spacer and Coolant By-Pass and his truck was a full truck length faster. I may have saved $300 a year by running 87 octane, but the performance loss is not worth it. Quote Link to comment Share on other sites More sharing options...
SR-25 Posted May 13, 2007 Report Share Posted May 13, 2007 Im not sure but its hittin me over 80 bucks to fill her up a week. I'm still thinking about selling my truck if someone is intersted in it im willing to work the price to someones liking but i do have a limit that i will not disclose because i still owe on the truck. LOL its costing me about 80 bucks every 3 days. So I hear ya! Quote Link to comment Share on other sites More sharing options...
ssfromsd Posted May 15, 2007 Report Share Posted May 15, 2007 i run 89 (never any ethanol) for over a 1+ years, no prob with my truck i have noticed, only a CAI though, 15.1 avg mpg so i would say its alright, just my $.02 Quote Link to comment Share on other sites More sharing options...
12'SROCK Posted May 16, 2007 Report Share Posted May 16, 2007 lower octane fuel The LQ9 in our SSSs have 10:1 compression, running anything lower than 91 is stupid. Lower octane = detonation and pinging = knock retard = lower fuel economy and less power Quote Link to comment Share on other sites More sharing options...
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