Jump to content

Run Premium or Not?


Main3s

Recommended Posts

Ok, something primarily for forced induction cars...

 

People I keep talking to are whining about running premium, it's "too expensive" they cry. What? Since when?

 

I have an 18 gallon tank. On average I don't run it to the E line, so likely I'm putting in 15 gallons at a fillup.

 

Assuming you are paying $4.09 a gallon for regular that is $61.35

Assuming you are paying $4.29 a gallon for premium, that is $64.35

 

That is A total of $3. $3! How FAR can you go on $3? Lets say you get 25 mpg (I know, you all probably do much better unless you keep your foot in it), that is 0.73 gallons, a total of 18 miles you can go on that $3. IF you get better mpg with premium (most cars do now that have the high/low octane tables properly setup), it is EASY to get better mpg with premium than low octane.

 

The % difference is mimimal. The distance you can go can really end up being much improved.

 

So why NOT get a good tune if you don't already have one, and enjoy running premium?

Link to comment
Share on other sites

Honestly I laugh anymore, and it's a game to me to see how high of a price I can pay. It's gong to be pretty hard for a while to beat my GT100 purchase of $7 a gallon, Look up VP fuel though some of it is $20-$50 a gal I think. :)
Link to comment
Share on other sites

Honestly I laugh anymore, and it's a game to me to see how high of a price I can pay. It's gong to be pretty hard for a while to beat my GT100 purchase of $7 a gallon, Look up VP fuel though some of it is $20-$50 a gal I think. :)

 

when i get c16 its normally 11-13 dollars per gallon

Link to comment
Share on other sites

e85 it's 105 octane and cheaper then 87. i would be running my GTP on e85 if EFILive could tune the GTP.

 

i am currently running the vette on e85 :) still working on it but so far it's got 30 deg of timing with no knock. and i'm getting 25 MPG (still a little rich) instead of 32 so i'm breaking even as far as mile per $ goes.

Link to comment
Share on other sites

Guest EM1 2ENVY
e85 it's 105 octane and cheaper then 87. i would be running my GTP on e85 if EFILive could tune the GTP.

 

i am currently running the vette on e85 :) still working on it but so far it's got 30 deg of timing with no knock. and i'm getting 25 MPG (still a little rich) instead of 32 so i'm breaking even as far as mile per $ goes.

 

 

rob, any differences as far as power from E85 to premium?

Link to comment
Share on other sites

rob, any differences as far as power from E85 to premium?

 

rather not say cuz only info i have is seat of the pants i'd like to get it on the dyno but i want to put in bigger injectors first because the stock ones are running at 120%. but i am running 4 more degrees of timing then what i was with 94 octane SO FAR i'm not even sure what the max is before it will start to knock.

 

if anyone has any injectors i can borrow that would be awesome :)

 

word on the street is to expect 5% increase in HP so for me it should take it from 460 to the motor to 483 HP. but i'd rather find out for my self what i can get out of it.

Link to comment
Share on other sites

Guest EM1 2ENVY
rather not say cuz only info i have is seat of the pants i'd like to get it on the dyno but i want to put in bigger injectors first because the stock ones are running at 120%. but i am running 4 more degrees of timing then what i was with 94 octane SO FAR i'm not even sure what the max is before it will start to knock.

 

if anyone has any injectors i can borrow that would be awesome :)

 

word on the street is to expect 5% increase in HP so for me it should take it from 460 to the motor to 483 HP. but i'd rather find out for my self what i can get out of it.

 

nice did you base line before the E85? an your running 120% duty cycle? swap some big boys in there asap. lol, do you know what the stock injectors are good to?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...