Basic question for ya, a bit subjective I know... my car is not a daily driver so annual miles are very lowl. I am planning on CAI and tune and would think I should go 93 since the extra cost of the fuel each year would be miniscule. I suppose the big question is how much of a gain can you get from 87-93 tune and would you actually feel the difference the first time you run the 93 vs the 87? ..just your thoughts since I see you run the 93 tune. I do have 93octane readily available here. Thanks for any input/insight you might have. I'm assuming there are no mechanical drawbacks (engine wear) etc to be concerned with but if you've heard of any, do let me know. ...pretty sure this is the route I'm going to take. Thanks much!

 

91 with a tune.

 

93, but I have a tune.

 

93 all the time

 

91 with a custom tune from ST Motorsports

 

I have to run 91 with the Shelby (Ford Racing) calbration from the get go, but i run 95 with my track only tune.

Yes , your wasting your money unless you change the tune..................

 

using a higher octane fuel will cause the computer to adjust your timing.you will gain, just nothing noticeable.

on a related note, dont use discount gas. it gets blown out from the big name guys who couldnt get rid of stuff that was sitting around. it may have started as a quality 93 octane, but it sat forever and is probably under 90 by the time they put it in their 93 pump.

 

93 fulltime. (tuned) 4 me.

Pointless on a new car unless required by factory. Older cars yes it well help with hard idle/knocking. Our SUV (Lincoln) says on the gas cap
(91oct or higher required) You will be fine on low oct until tune.

 

use 14 gal. 91&2 gal. 101.comes out to 93+.in az,nothing higher than 91 outside vp or torco.i have mods done to mine,not stock.if you want to keep valves& stuff clean,once a month run chevron prem. thru it.

 

F.Y.I.

Here's an article about gasolines...
http://www.ftc.gov/bcp/edu/pubs/cons...tos/aut12.shtm

Also, running a higher octane fuel in an engine designed to run 87 regular can have detrimental effects on the emission systems, specifically, the catilytic converters by overloading them with unburned hydro carbons. High octane fuels are designed to burn slower for higher compression or cylinder pressures. Unfortunately, the term "premium" used with high octane fuels is misleading. The fuel is no better in engine, injectorcleaning than regular grades from the big suppliers. All grades have the same basic additive packages. The only difference being the octane boosting agent used. Save your money unless you have modified your engine to run higher octane fuels.