We can use E85 in our cars?

 

With a conversion kit. Absolutely not stock!

 

93 if available, if not 91. 7,000 miles. I bought the car with 5,000 miles on it and few of us know what octane was used before we bought it. Pretty scary huh?

 

93 octane in both with no issues.

 

I know I'm going to be crucified but here's my answer.

When gas prices shot to hell and back I started mixing.

My theory, I'm probably wrong but it's working and I haven't noticed any differences or problems.... anyway

The manual says 91 octane, here in TN we have 93. OK, so when prices went up here's what we started... I'd fill up with 93 then when it got to half a tank I'd top off with middle grade/89 octane.

Let's do the math.... 93 + 89 = 182 now divide that by 2 to get the average and you get ... 91 !!! Just what the manual calls for.

Now when it gets to half a tank again it's back to 93. Back and forth unless I let if fall too far below half a tank then full 93.

 

I don't see a thing wrong with that if you want to go to the trouble. Takes a little time to do. I figure you save about .20 cents per gallon on the second half of the tank which would be 8 gallons if empty. Saves $1.60. Go in and buy a Coke with the savings.

 

Exactly, Diet Dr. Pepper.

 

If I remember correctly. Octanes don't mix. So that means you are using 93 some of the time and 89 the rest of the time.
But I heard that many years ago and it may not be correct.

 

Maybe it depends on which octane you put in first. It might be that you could layer the octanes, 2 gal. 93, 2 gal. 89, 2 gal. 87, 2 gal. 93 etc.

Just kidding aschrager, you may be right but it doesn't sound right that the octanes will not mix.

Any experts out there that could clarify this.?

 

The grades mix quite well. In fact, that's how you arrive at your mid-range grades - simply a blend of premium & regular. Most of the time they're mixed at the pump but can also be done so within the delivery tanker itself.

 

Premium Only

 

Premium 91 or 93

 

I use Sunoco Ultra 93 and Gulf premium 93 octane. The difference in 93 versus 87 octane in my area is 20 cents a gallon. For a lousy $2-$3 more a fillup I'll stick with the premium gas for premium performance. My mpg's are great so I'm not worried about paying a bit more. My XFire now has just over 9000 miles on the clock.

Bob

 

I mostly use Sunoco Ultra 94 or Shell V-Power (Fuel recommended by Ferrari).

Our cars engine design are made to enhance fuel economy and reduce exhaust emissions, along with higher compression ratio, valve set up and dual plugs per cylinder your tank should ONLY see Premium fuel, unless you are planning to do a premature engine change, Pay me now or pay me later...stick with best fuel possible.

 

RENNtech tuned my SRT 6's ECU for 93 octane, but I run Sunoco Ultra 94 in it. There has been a few gallon of 93 put in it, but that's only if 94 is not avaliable. The car only has around 3,400 miles on it, I drive my truck to work because I park in a small gravel parking lot and there's a lot of dust from people driving by on a short gravel access road . That's one reason for the low miles on the SRT 6 plus the fact if the wife and I go anywhere she hates to ride in the SRT 6, so we take my truck or her Envoy.

 

My car had 40 miles on it when I bought it. Since then nothing but premium. Just turned 19k with no problems so far.I also have a Magnum r/t, a Denali, and a Chevy HD 2500 but I choose to drive the SRT/6 because it's just too much fun.

 

Had about 200 on mine, and I too only use premium and I'm at about 12k and getting about 25 mpg with an auto. I thought about doing the "pump shuffle", but as my wife put it "to save what?". The station where I get my gas is only $.10 more between regular and premium, so why go through the extra work.

 

Unfortunately the only premium in my town is 92 but thats what I use

 

4,800 miles and only premium. Usually Shell or QT ( which is 91).

26.1 MPG average but I'm mostly highway driving. Not gently either. Car just loves to go fast.


roadster with a stick

 

I guess I'm one of the only ones that will run 87 octane back and forth to work when I'm not pushing it. I let the computer do the work. I put 91 octane in when we made the run to Mt Evans at 14,000 ft. or I'm running it hard. I filled it back up, put 9.7 gal and ran 273 miles, you figure it out. I have 17,000 miles on it and seems to run fine. I know later a new engine??? Can anybody give me any stats that show where engines are being replaced because of lower octane?? I'm not talking about all you race car drivers out there... You'll replace an engine just because you run them hard and don't tearem down like you should.

Now you can beat me up, come on I'm ready for yah I just hope you've got 91 in your tank.... lol