- #10 of 2757
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Re: When and What [jpenn]
by rockylee
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Sep 25, 2006 (7:54 am)
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Replying to: jpenn (Sep 19, 2006 9:28 am)
I hope it competes with the BMW 3. It will need over 300 hp. to do that though. 
Rocky
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- #11 of 2757
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Re: When and What [rockylee]
by chrisl0
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Sep 25, 2006 (11:30 am)
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Replying to: rockylee (Sep 25, 2006 7:54 am)
Yea it really needs that. I just hope they can do that without premium fuel.
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- #12 of 2757
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Re: When and What [chrisl0]
by rockylee
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Sep 25, 2006 (11:51 am)
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Replying to: chrisl0 (Sep 25, 2006 11:30 am)
Does the current 3.6 "HF" V-6 require premium ?
If it does is it really that big of a deal ? All the competition I have read about uses premium. I personally can't wait to read more about the new CTS, since I'm considering it as my next vehicle of choice if I don't go 2007' GMC Sierra Denali first. 
Rocky
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- #13 of 2757
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Re: When and What [chrisl0]
by sls002
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Sep 26, 2006 (6:23 am)
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Replying to: chrisl0 (Sep 25, 2006 11:30 am)
I don't think direct injection has to require premium fuel, the compression ratio and tuning also determine octane needs. But if you want to keep the engine small, and want more power, higher octane fuel may be required.
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- #14 of 2757
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Re: When and What [rockylee]
by chrisl0
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Sep 26, 2006 (6:34 am)
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Replying to: rockylee (Sep 25, 2006 11:51 am)
One of the big strengths I always thought the CTS had is that it can give you all the luxury without paying for it at the pump. I would never buy a car that needs premium unless its gets 50 MPG City/Highway. The current CTS can run on 87.
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- #15 of 2757
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Re: When and What [sls002]
by chrisl0
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Sep 26, 2006 (6:36 am)
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Replying to: sls002 (Sep 26, 2006 6:23 am)
Well the Sky Redline and Mazda CX-7 uses direct injection and they both require premium fuel. From that I drew a conclusion that all cars with direct injection required premium.
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- #16 of 2757
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Re: When and What [chrisl0]
by pearl
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Sep 26, 2006 (6:47 am)
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Replying to: chrisl0 (Sep 26, 2006 6:36 am)
sls002 is correct - direct injection by itself has nothing to do with needing premium fuel - it is simply a very efficient means to get the gas into the combustion chamber. However, so far, manufacturers have mostly used it on their pricier performance models where they also tend to jack up the compression ratio - which DOES often require premium depending upon cam timing, etc. I don't know what Caddy will do here. Clearly there is a marketing advantage to having the engine use regular fuel; however, this means that they will probably also have to "detune" other aspects of the engine (timing, compression, etc) to make it run on regular thereby giving up some horsepower/performance. Since virtually all of the CTS's main competitors demand premium fuel, Caddy may just decide to go for performance and require it too. We will have to see.
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- #17 of 2757
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Re: When and What [chrisl0]
by rockylee
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Sep 26, 2006 (10:00 am)
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Replying to: chrisl0 (Sep 26, 2006 6:34 am)
Well 300+ hp. can be done without using premium. I however agree with others that direct injection could require premium to get the performance and if so it's not all that more expensive. It does save you a mile or 2 in fuel economy on GM cars.
Rocky
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- #18 of 2757
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Fuel prices premium vs regular
by thebug
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Sep 29, 2006 (6:59 pm)
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The difference between premium and regular fuel is usually about twenty cents. If you had a 20 gallon tank, it would cost 4 more bucks to fill the tank. If four bucks is an issue, then one sould probably assess other areas of their financial profile. I know that I waste at least four bucks a day on someting without a doubt. That's not really a enough to worry about. Do the math, and you too will find a considerable waste as well.
thebug...
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- #19 of 2757
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Re: Fuel prices premium vs regular [thebug]
by pearl
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Sep 30, 2006 (4:05 am)
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Replying to: thebug (Sep 29, 2006 6:59 pm)
yes, I agree that unless one drives an incredible number of miles per year, the difference in premium vs. regular is probably no more than around $200/year or so for most people - and if the car is a better performer (power and fuel mileage) as a result - no big deal? However, I think the thing that kicked off this discussion was whether or not using direct injection would require premium fuel - answer: no, by itself - but Caddy may decide to require premium if they also do some other engine performance tuning like upping the compression ratio or specifying hotter cam timing, etc, to get more power.
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