I run 99 Ron (Shell VPower) and it loves every minute of it. I pay £1.02 per litre (£4.64 per gallon) that's $9.78 per gallon to you lot across the big lake...and it is worth it for me over the 95 ron fuel. So go fill yer boots with that cheap high octane fuel and remember how much we have to pay for it in the UK and it should make you feel better and buy the good stuff everytime without thinking it is expensive.

 

the cars computer will adjust just fine to cheap gas...they're not a performance vehicle by any means so unless you have an SRT-6 you can throw cheap **** in all day long.

 

Regular will work but it won't save any money. I accidentally put regular in my car once and it ran OK because the computer adjusted to it by retarding the ignition. I had less power and mileage went down enough to kill any savings. 10.5 : 1 compression is way too much for regular. IF you drove your SRT real easy and below 2,500 RPM, the SRT would have run better on regular since it has lower compression.

 

Simon-srt6... A gallon of gas is smaller over here.
In the UK... 20 oz to a pint: 8 pints to a gallon.
In the US... 16 oz to a pint: 8 pints to a gallon.
So your conversion is not apples to apples - I agree though, it's still cheap. Everybody over here complains when it goes up $0.02.
I nearly have a heart attack when I go the UK and fill up a car with petrol.

You can drink more pints over here before you fall down!!!

 

Just put the right fuel in it ... I see the same 'octane debate' on most every forum for nearly every newer car I've ever owned, to include Harley Davidson forums. If you can't afford the fuel, you probably can't afford the car. I think the only forum I've NOT seen the octane debate is the Viper forums - Those guys would go off on anyone suggesting they know better than the manufacturer. :-)

Mike

 

By your own definition Summerwolf, just what is a "Performance" vehicle?

Inquiring minds want to know.

 

Performance or not, the engine was designed to take a higher octane fuel...seriously it's $2 - $3 more. If people are so hard up for cash, sell the car and buy a Civic

Also, the points of that it lowers efficiency negates putting in cheaper fuel since you'll have to fill up quicker and eventually, over the long haul, spend more money on fuel. I'm pretty sure the engineers know more about what needs to go in the engine more than 90% of us here do.

 

Read this:

http://en.wikipedia.org/wiki/Octane_...rement_methods

Have fun!

 

Again, because of a brain fart, I accidentally tested regular fuel. Our knock sensors and computers adjusted to the fuel and the car ran fine. I experienced less performance and worse mileage. Because of the drop in mileage I believe you can't save money and in fact will actually spend more to use regular. A 10.5:1 compression engine is not going to run with the ignition at optimum advance on regular. Even if this did work without the negative side effects, you are only saving a couple of dollars per tank. If this is that important sell your Crossfire to someone that will take proper care of it and buy a Prius.

 

I run 93 octane in both the crossfire/daytona ram fill them both up twice a month. Hmmm that's 82+ per month don't care, that's not counting 600 gals. of 93 octane in the boat. If ya want to play you got to pay. Big Oil Co. bring it on.

 

corvette, GTO, solstice GXP, EVO, STI... Vehicles that can move in a straight-line and handle their as*es off is a performance vehicle...

the roadster is ok at best in a straight-line and doesn't have near the handling I was hoping. It took a while to like autocrossing this thing.

like I said if you have the NA V6 you're fine putting whatever in...I use premium but you don't HAVE to, if you have the SRT6, you'd run premium.

 

The NA V6 motor is high compression, your a fool if you put the cheap stuff in it, period. Buy a hyundai excel if you want to **** in the tank!

 

that's kind of funny...everyone needs a beater!!!

 

Anyone deferring from the minimum OEM octane level specifications is simply inviting trouble to their doorstep.

Folks... this is why car manufacturers make "Owner's Manuals"; when in doubt, read the manual. These manuals are provided for that reason (not just to take up space in your glove box)!

Just my humble opinion.

XFH

 

My 2005 Roadster owner's manual says Premium (91 Octane or Better) is required. Not recommended; but required. So that is what I go with.

BTW here in North Carolina we usually can get 87, 89, or 93 octane. There are a couple of places that have 91 octane around here; but not many.

A couple of times when I have had 3/4 of a tank of 93 octane; I have topped it off with 89 figuring that would do no harm. But I would never run a full tank of 89 or 87 octane in it.

 

OK Summerwolf, now we have a base line to go by. Something needs to run in the 13's, 12's or better to be considered a performance car by your standards. There's nothing wrong with that, but remember we all have our own standards that we judge things by.
Since I'm from the "Muscle Car" era, anything that can run in the 15's or better stock, was (and as far as I'm concerned still is) a performance car.
When it comes to handing, the Crossfire coupe can run a slalom close to, and better than, some of the cars you mentioned so there shouldn't be any argument there.
But since we're talking about what needs higher octane and what can get by on less, it should be a question of compression ratio and nothing more.
Expecting your engine management systems to take care of the lack of octane by dialing back your timing, is not the best way to go if you expect not to have "gasoline" related problems with your engine at some point down the road.
We have a 10.5:1 compression ratio, and that's why we need higher octane. An '06 Viper (that some may consider a performance car) has a 9.6:1 compression ratio, and Chrysler feels it should use the same octane as the Crossfire.
I realize gasoline prices are terrible, but skimping on the type of gas you put into your sports car just isn't the smart way to go about saving money.

 

Look above, I said I'd never run the cheap **** in mine, just saying you can...and also at some point in time if you ever drive through new mexico and arizona...there are places you'll pay premium prices for 88 octane gas because thats the highest they have.

 

As a matter of fact, last Dec. 29th. I spent one of the longest days of my life trying to traverse the fair states of New Mexico, and Arizona thanks to Rt. 40 being shut down due to a snow storm. To be honest with ya, I really wasn't paying much attention to the gas pumps octane ratings, and I wasn't driving my Crossfire either. But the Crossfire I was following fueled up at every station I did, and had no gasoline related problems, so if it was low octane he didn't notice any difference.
I'm not saying you can't run cheap fuel in your XF, I'm saying you shouldn't. I just think that you are doing everybody who plans on keeping their car for an extended period of time a disservice telling them it's OK to run low octane fuel.
Probably more than anything else, I was taking umbrage to your statement that the Crossfire wasn't a performance vehicle, when I think most non-SRT owners on this forum would disagree with that statement as well. But knowing what your expectations are, then I see where you're coming from.

 

Well, I don't think it would be a big deal to run cheap **** in this car...its not turbocharged, it has a "high compression ratio" compared to what man, a lot of current hondas run similar compression ratios and are meant to run on cheap ****. One of the main reasons I'm not planning on keeping this thing...it doesn't handle the way I thought it would...its nose heavy, and without enough power to power steer it through...its just not good to go with my driving style. Using it as a daily driver has been okay, but its time to get two fast daily drivers.

Through New mexico...it was weird, they said the altitude let em run lesser octane ratings...I know the goat didn't really mind. I put the highest octane I could and coasted it and I got 25-28 MPG through new mexico...gotta love double overdrive.

 

I guess if you really wanted to make the care run on cheap gas you could install SRT6 pistons, though what would be the point of that? lol.