Cadillac CTS-V - pump gas
07-09-2006, 06:31 PM
I looking into buying a V and want to know it you have to run premium gas in it, I've had a LT1 z and it had no problems on 87 oct. I've also seen many LS1 z's running on 87. Who knows what it takes to run E85. I'm not to worried about the extra cost of fuel, but what the hell why not save when you're not racing!
07-09-2006, 11:05 PM
07-10-2006, 01:34 AM
Octane is not the only thing that matters.... see this:
but yes, premium!
07-10-2006, 03:05 AM
07-10-2006, 01:42 PM
Whenever I get service, they wash my car and fill it up...with 87. The V will run, but whenever I give it more than ~40% throttle in lower RPMs I hear the knocking. On those tanks I take it real easy even though the reduced part throttle power makes it hard at times.
07-10-2006, 03:08 PM
thats funny because im sure on the cap it says fill with premium. my 98 z does and thats all it gets. especially in california with our crappy gas
07-10-2006, 04:29 PM
i would tear that dealership a new one man. thats BULL
07-10-2006, 04:59 PM
I can't really complain, they are't REQUIRED to do it...it's just a favor. It does bug me a little, but like I said above, as long as I keep my foot out of it the V runs well enough...it's just too hard to turn down a $50 tank of gas!
07-11-2006, 07:25 PM
When I am driving in-town I always use premium.
But when I take long trips (more than one tank), then I switch to 87 octane. Most of these trips are on Interstates with light throttle, so no knocking. When I am on Blue Highways, I always downshift to pass - again no knocking.
My experience so far is that gas mileage is a bit better with 87 octane on the road. Mileage increases roughly 1.0-1.5 mpg with 87 octane.
07-12-2006, 06:54 PM
Thanks for the info everyone.
07-13-2006, 07:38 PM
08-01-2006, 01:01 PM
I just tried a tank of regular 87 octane and it noticeably degrades performance....
02 Tahoe on 20s
08-01-2006, 01:31 PM
owner's manual says use premium.
08-01-2006, 05:22 PM
my dealer also filled teh car up with 87oct. and it ticked me off, but it was free so i had to suck it up.
Performance is low with lower oct. fuel and the amount of left over contaminants is higher with lower oct. fuel.
50 bucks for 87oct. WOW, i pay just about 52 bucks for a full tank of 93oct. down here in miami... whats your premium like?
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