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That doesnt make sense to me, as I though the 93 octane tune is identical to the 91 tune except for advancing the timing some for the higher octane fuel. Some are saying the 91 octane tune is better than the 93 octane tune. The 'top grade' fuels, such as 'Shell V-Power 93' and 'Chevron with Techron 93' have better additives and usually do not contain any ethanol (some pl.

Answer (1 of 21): I prefer to use 93 octane (or the highest available) at commercial gas stations because they tend to contain higher quality fuel. The Issue: At the Tire Rack SCCA Solo Nationals. All things being equal, an engine can be tuned to make more power on 93-octane fuel than 91. The Availability: Those in the western half of the country usually only have access to 91-octane fuel, while 93 octane is fairly common in the eastern half.

Fuel may not exceed 15% ethanol (E15).”.

Don't forget to subscribe to stay up to d.you'll get the throttle response benefits and more power, but not as much as the 93 tune will give you with piggies your timing retard is gonna be high anyways, on either 91 or 93, though the 93 tune should be able to be marginally more aggressive with the timing On Today's Episode of the RPM Web Series, we find out how much our Stage 3 package makes on 91 Octane & 93 Octane. Conclusion: Unless your tuned for 100 or higher octane, it's not worth the 93 tune. In fact the 93 octane run was a little slower in time and 1 mph less. Then the 93 octane tune, had no difference at all from the 87 tune ironically.

The car dropped (as in faster) 3 tenths off the 1/4 add added 2-3 mph on 91 octane vs 87.An engine can be tuned to make more power on 93-octane fuel than 91. The western half of the country usually only have access to 91-octane fuel, while 93 octane is fairly common in the eastern half.Using race gas or higher Octane just assures you that you will be getting 100% out of your tune 91 or 93. The 93 will adapt up to say 98 I think thats what was said in the past. The 91 will adapt up to say 94 or what you would normally see as a swing in good gas. The price difference between filling with 91 or 93 should be less than $5 a tank so if you have access to 93 use that. Premium may be a lot more expensive than regular, but at a station that carries both 91 and 93, its usually only a difference of a few cents a gallon.I've run both 91 (while I was in California) and 93 (here in Virginia) versions of the same tune (Cobb stage 1 and 2 OTS) on stock Fiesta STs.

The amount of extra power from tuning on 93 is not worth the trade off you would get instead of tuning on 91 and having a nice safety margin.