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Old 08-29-2009, 10:25 PM   #1 (permalink)
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Regular or Premium GAS

I have a 2007 srt8. I read in here somebody to the most part burns regular instead of premium. Does anyone else do this? Is this ok to do? need some feed back..thanks
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Old 08-29-2009, 10:42 PM   #2 (permalink)
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Quote:
Originally Posted by usslasalle View Post
I have a 2007 srt8. I read in here somebody to the most part burns regular instead of premium. Does anyone else do this? Is this ok to do? need some feed back..thanks

SRT8 is designed for premium for optimum performance.
87 is not good enough, u lose power and may harm your car over time?(correct me if im wrong here)
i use ONLY 93, and ONLY ethanol-free. if you have that available, that is what you need to use.
u bought a special vehicle that requires special maintenance, i.e. synthetic oil, premium gas, premium brakes, premium tires.
dont go cheap to save LESS THAN $5 per fillup.
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Old 08-29-2009, 11:16 PM   #3 (permalink)
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your knock sensors will dial back your timing if you use 87. so you shouldnt be doing any damage.

so if you dont care about performance(which wouldnt make sense if you bought an SRT in the first place), then go ahead and run 87.

but the car is designed to run 91. so for the extra $2 per tank of fuel, why not just run the premium??
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Old 08-30-2009, 12:16 AM   #4 (permalink)
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As others have stated, the SRT8 was designed for performance, and premium fuel is recommended. Your SRT8 will produce less power with the lower octane fuel and I would not recommend trying to save a little money at the sacrifice of performance. If you want to save money on fuel, don't own an SRT8. It's that simple.
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Old 08-30-2009, 03:15 AM   #5 (permalink)
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Quote:
Originally Posted by srt8man View Post
As others have stated, the SRT8 was designed for performance, and premium fuel is recommended. Your SRT8 will produce less power with the lower octane fuel and I would not recommend trying to save a little money at the sacrifice of performance. If you want to save money on fuel, don't own an SRT8. It's that simple.

the thing that really gets to me, on this subject. is some people have the idea that this is giong to save u a lot of money. but really, how much gas does the average person burn?? like a tank a week?? so the 2$ you save on a tank, times 52 weeks in a year. and you saved a whopping 104$, for an entire year. hardly seems worth it to me.
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Old 08-30-2009, 09:59 AM   #6 (permalink)
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Yes, I even know some people who try to save money by alternating a half tank of regular followed by a half tank of premium. I would think this may even be worse because the computer is constantly trying to learn a different blend of fuel. Those people would be saving almost nothing. With a high-performance car, I want to extract every bit of performance possible. Using the recommended fuel seems like a no brainer to me. I suppose that in a pinch if there was no premium fuel available and you are completely out of fuel, using some regular would be okay though.

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the thing that really gets to me, on this subject. is some people have the idea that this is giong to save u a lot of money. but really, how much gas does the average person burn?? like a tank a week?? so the 2$ you save on a tank, times 52 weeks in a year. and you saved a whopping 104$, for an entire year. hardly seems worth it to me.

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Old 08-30-2009, 10:21 AM   #7 (permalink)
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I have run regular many times, does not seem to effect power, I run 90 with 10% ethnol, that is regular with ethnol, all the time, to no bad effect, I still average 18.9 mpg (US) i currently have 116,000 miles on car, same plugs
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Old 08-30-2009, 10:52 AM   #8 (permalink)
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It absolutely does affect power. I'm guessing that the difference is probably 10-20 hp at peak RPM (depending on make and model of course), so you may only feel the difference at WOT. Back when I owned a G35 sedan, the dealer would loan me another G35 when mine was in the shop. My G35 always felt faster and I'd be willing to bet that at least part of that difference was because most people probably topped the loaner off with regular before returning it - that's exactly what I always did.

Maybe some forum members have experimented on the dyno with different types of fuel and I'll let them help out here. I recall an article in Car and Driver magazine on the Pontiac G8 GT, and they showed the power with premium vs. regular, and the difference was substantial. People here are changing their intakes and doing other mods for far less improvement. Using the proper fuel is the simplest way to get more power. If one doesn't care about more power, it raises the question "Why drive an SRT8?".

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I have run regular many times, does not seem to effect power, I run 90 with 10% ethnol, that is regular with ethnol, all the time, to no bad effect, I still average 18.9 mpg (US) i currently have 116,000 miles on car, same plugs

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Old 08-30-2009, 11:22 AM   #9 (permalink)
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Quote:
Originally Posted by usslasalle View Post
I have a 2007 srt8. I read in here somebody to the most part burns regular instead of premium. Does anyone else do this? Is this ok to do? need some feed back..thanks
If you want to use 87 octane, I'll trade you my Touring. That way that SRT8 will be used the way it was meant to be.
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Old 08-30-2009, 12:04 PM   #10 (permalink)
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interesting

seeing as how Lucky runs his up and down the "Coke" at 270+ KPH, I guess that Canadian ethanol blend is all right!

But yeah, the prevailing wisdom sez if you're tuned for it use it. The important part to remember is that you cannot harm the engine by using lower octane fuel. The stock knock sensor programming is very aggressive, and retards the spark at the slightest bit of knock/pre-ignition.
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