[adrenaline=lifeline]

Would a 93 octane tune help my mpg or hurt it?

[1FUN4RD]

I dont think it will hurt your mileage, but I also dont think it will help it.

[silvergtstang99]

if its done correctly it will help a little.

[03_StangGuy]

It will make your car more efficient and get u closer to the perfect a/f ratio. Performance chips usually say you get a mile or two gain. Id do a few mods and then get a tune, its not worth it stock

[C MY 4D]

I had a 50 miles per tank difference when I tuned my 01 for 93.... It outweighs the higher cost of premium.

[cliffyk]

Originally Posted by C MY 4D I had a 50 miles per tank difference when I tuned my 01 for 93.... It outweighs the higher cost of premium.

This was my experinece as well, though not quite as dramatic, maybe 1 to 1-1/2 mpg...

[03_StangGuy]

Originally Posted by C MY 4D I had a 50 miles per tank difference when I tuned my 01 for 93.... It outweighs the higher cost of premium.

Originally Posted by cliffyk This was my experinece as well, though not quite as dramatic, maybe 1 to 1-1/2 mpg...

Really thats interesting.

[HBK_2007]

does the better gas give you enough increase in gas mileage to make up for the increased price?

[cliffyk]

Originally Posted by HBK_2007 does the better gas give you enough increase in gas mileage to make up for the increased price?

Right now, here in Saint Augustine FL regular is $3.799 a gallon, premium is $3.999--a 20¢/$3.799 = +5.26% more.

I got 20.5 mpg before the 93 octane tune and 21.7 or so after, that's a 5.85% increase--so call it break even.

But beyond this, there is still a silly 20¢ to 30¢ difference between 87 and 93 octane--for a 12 gallon fill-up that's a whopping $2.40 to $3.60 more ($48 vs. $45.60)--skip the Starbucks latte that morning and enjoy the better performance!!!

[HBK_2007]

well i think 91 is the highest they offer here, i dont remember exactly what the price for premium is but regular is 3.59 as of 3:00 pm today

[neverfastenough1]

Originally Posted by cliffyk Right now, here in Saint Augustine FL regular is $3.799 a gallon, premium is $3.999--a 20¢/$3.799 = +5.26% more. I got 20.5 mpg before the 93 octane tune and 21.7 or so after, that's a 5.85% increase--so call it break even. But beyond this, there is still a silly 20¢ to 30¢ difference between 87 and 93 octane--for a 12 gallon fill-up that's a whopping $2.40 to $3.60 more ($48 vs. $45.60)--skip the Starbucks latte that morning and enjoy the better performance!!!

+1 At 20 miles per gallon with our 15.4 gallon tanks and a .20 cent difference, 1.3 extra miles per gallon will break you even. Anything better than 1.3 will be saving you money and getting better performance like Cliffy said.

[HBK_2007]

but u only get that gain if your tuned for it?

[cliffyk]

Originally Posted by HBK_2007 but u only get that gain if your tuned for it?

Of course, that's why I recommend a premium fuel tune and/or tuner as the first mod (well, maybe exhaust first)--but changing anything on the intake without a tune doesn't do much...

We are quite fortunate here in Florida, we get 93 octane year round and there's no such thing as emissions testing or any sort of inspection too!

[MamaStang]

Noticing about 30 some extra miles to a tank on my car with my tuner - running mid grade...

[cliffyk]

Nothing has changed in my 45+ years dealing with automobiles--there's fast, cheap, and safe and you get to pick any two...

I have tuned for and run premium fuel in every car I've owned, including a late '85 sold as '86 Corolla that was one of the very last RWD, carbureted Corollas made. 76 HP from the factory I had it dynoed at 118 HP with IHE, timing and re-jetting the carb...

[neverfastenough1]

Originally Posted by HBK_2007 but u only get that gain if your tuned for it?

Thats right. Running higher octane fuel without a tune is actually hurting your fuel mileage. Higher octane lets you tune your car for more advance timing which gives you the extra hp. If you don't advance the timing the fuel won't burn fast enough with the higher octane so the explosion will happen too late in the piston travel. Someone can correct me if I am wrong.

[adrenaline=lifeline]

thanx for alll the input. now im standing at a cross roads of fixing my car and painting it and sell it and take cash and buy a gaser anda 5.0 project car ora new edge roller or just stick w my ride

[zinc02GT]

5.0 project and Honda sounds liek the best plan dude

take the path Edgars dad has Edgar on. Thing is sick, but on yours, go longtubes. Thing would be sick as hell

[adrenaline=lifeline]

if i went 5.0 id go custom like his dads sick ass ride. i rode in edgars w the new tranny about 10 min ago

[zinc02GT]

oh crap... much faster???