dirtriderdrew77

ok i have been running 87 gas from cheveron for ever. now i was wondering is better if i try a higher octane like 89. cause i put it in there once and the car felt a little more jumpy on the throttle lol but i dont know if it is good for the car.

howarmat

its fine, no harm done

my first mustang

Without a tune for 89 it will be a waste of money,will make NO difference. Keep using 87. No harm though.

howarmat

there are some differences depending on alt, climate etc.....usually higher oct is better quality gas with more/different additives also

tmsmith

Did a little test for myself...

I filled up a tank completely with the lower end (87 I think) at my local BP gas station. Ran it till I had around 24 miles till empty (interior upgrade). Knowing that it wouldn't be an exact amount, I also reset the trip odometer. It was at 288 miles. To recap:

Miles till empty: 24
Trip Meter: 288

Then went to the same gas station, and filled up on 93. At 288 miles on the trip meter, I still have 47 miles till empty. You can do the math to see if the amount of money spent towards 93 is sufficiant enough to get over the 87. Also, different areas have different prices on gas so.

Miles till empty: 47
Trip Meter: 288

But I did get better gas mileage. Didn't notice much change, if any, to the throttle responds, although I was going for gas mileage. Maybe my next test will be to test that. If anyone wants to they can calculate the amount per gallon to 93 and 87 to see if it is worth spending the extra bucks for 93. I did it once, but I do not remember my numbers, and don't have time to do it now.

Just thought I would add my two cents.

musicheadt

93?

Baddog

Do you guys not have 94 octane pump gas in the U.S?

GidyupGo

Save your money. There is no difference in additives between the 2. The 89 just burns a little cooler.

howarmat

yes sunoco makes 94 here in the US but i dont think any other do

Frank Bullitt

I will add my two cents.

My totally stock, 99 Ranger with 3.0, 4x4 and 5-speed manual definitely ran better on 93 than on 87. It also got significantly better gas mileage (around 2 mpg) better. Also different brands of gasoline can make a big difference. The Ranger without a doubt ran best and got the best mileage on Shell 93 octane.

I have not done any experimentation with the Mustang. I just put in 87 at whatever station is convenient, it runs fine and gets average of around 30 mpg in mostly interstate commuting at around 65 to 75 mph.