What grade of gas

[phil4watching]

What grade of gas do you guys use? i did use the highest grade the first few months but gas has been so ridiculous that i went to the lower grade. i read that all the higher grade does is give you more horses and the dealership says only premium octane so they can advertise their car to have more power.... what do you guys use and from what gas station? i use qt (quiktrip)

[rn79870]

This is going to be fun.

91 here, but we have hills, lots of hills.

[SVTCOBRA]

Bob, get me a beer while your up!

Let me give you the reader's digest.....almost everybody uses prem.

Telcoman uses 87, but he doesn't have a lead foot and lives on flat terrain.

[zozoka1212]

Noooooooooooooo,Oh boys I smell trouble here.

93 here

zozo

[rn79870]

No prob Rich,

Isn't there a thermal issue related to the type of fuel used?

[smockers83]

The grade of the gas itself does not give you extra horses, that's a huge misconception. I have a feeling the sedan, after learning its about 300 lbs lighter than the coupe, can take regular grade gas on a regular basis per recommendation because of the weight difference.

There are quite a few threads on this forum about fuel grades which to use, check out the search.

[gwoods]

All the smart people use 91

just kidding, the owners manual recommends 91 and if you plan on getting every drop of performance run 91.

You can PROBABLY run 87 and have no ill effects aside from lost power BUT is it worth is for $2.60 difference a tank?

[phil4watching]

yeah.. i thought the same thing. but i have to fill up every week and it starts to add up. and being 18 and not making but 17 and hour, its tough to afford..

[oldandslow]

Fuel octane requirements are determined by ignition timing for a given engine. Manufacturers choose octane requirements based on that given engines state of tune. Using a fuel with lower octane ratings than specified can be detrimental to that engine. Here's how it works. Lower octane fuels burn faster than higher octane fuels.Using too low of an octane fuel can cause predetonation.This is when the fuel is ignited too early because of it's faster burn.This happens when the piston is on it's compression stroke ,and still on it's way up into the combustion chamber.Ignition is supposed to happen just after this,when the piston is heading back down,which is it's power stroke.Since it is that explosion from the fuel ignition that forces the piston down in it's power stroke, imagine the forces against the piston,rod,crankshaft, & bearings, when this happens too early, as the piston is still heading up ,in it's compression stroke. Kinda like a head on collision.

[Jacko3]

zozoka:

No trouble here. I use 93. No thermal issues either

[zozoka1212]

zozoka:

No trouble here. I use 93. No thermal issues either

heheheh

You know what happened last time the fuel came up.

zozo

[gwoods]

Fuel octane requirements are determined by ignition timing for a given engine. Manufacturers choose octane requirements based on that given engines state of tune. Using a fuel with lower octane ratings than specified can be detrimental to that engine. Here's how it works. Lower octane fuels burn faster than higher octane fuels.Using too low of an octane fuel can cause predetonation.This is when the fuel is ignited too early because of it's faster burn.This happens when the piston is on it's compression stroke ,and still on it's way up into the combustion chamber.Ignition is supposed to happen just after this,when the piston is heading back down,which is it's power stroke.Since it is that explosion from the fuel ignition that forces the piston down in it's power stroke, imagine the forces against the piston,rod,crankshaft, & bearings, when this happens too early, as the piston is still heading up ,in it's compression stroke. Kinda like a head on collision.

Thats what happens in a car without a knock sensor on each bank. If your car has a knock sensor it will ADD fuel and pull timing to make the motor run on less then perfect fuel. The problem is there is not infinite adjustment, when the motor has pulled as much timing and added as much fuel as it can and there is still knocking you won't know until something breaks.

+2 for the great explination. Some of these guys are getting away with burning 87 in their G's. Its not worth $2 a tank to me.

[phil4watching]

gwoods... so you do use 91?

[gwoods]

I use the highest grade I can find and buy top tier (quicktrip, mobil or Chevron) gas only. Phoenix is 91 octane there are a couple place you can buy 100 octane

I run NOS or NX brand octane boost at the track although I'm not sure if it makes a difference.

[oldandslow]

Gwoods is correct regarding the knock sensors, but You people running 87 octane are living dangerously.The knock sensors are not there to provide for the daily use of 87. They are there to provide safety for those occasionally times when You get a bad batch of fuel , or have an emergency situation where all that is available, is a lower than required octane fuel.

[nuclearcarnie]

I use the highest grade I can find and buy top tier (quicktrip, mobil or Chevron) gas only. Phoenix is 91 octane there are a couple place you can buy 100 octane

I run NOS or NX brand octane boost at the track although I'm not sure if it makes a difference.

I also buy the highest octane I can find. I have nearly $50K into my G, if I was worried about a $0.20 difference/gal between 87 and premium I would have bought a prius.

I live in Michigan and can easily find 94 octane at the Sunoco stations and at least 92 - 93 everywhere else. I travel a lot with my job for months at a time often landing in California, the land of overpriced low octane fuel!!! I notice that even 91 will cause knock from time to time. I do find that the octane boosters help. I don't know the specifics of how effective they truely are but I notice less knock when I use them.

It's your money and your car, if you can afford a rebuild and think it is an over all cost savings, keep buying the 87 octane fuel.

[soul_hfk]

shell 93 is all i put in her

[telcoman]

This is going to be fun.

91 here, but we have hills, lots of hills.

Here we go again

[SVTCOBRA]

Where have you been?I've you several times with no responses...

[telcoman]

Where have you been?I've you several times with no responses...

Thanks for asking.How's your Mustang?

Been busy. Had to work all night Friday morning. Got pissed yesterday when after changing oil my 3 ton hydraulic jack failed to lift my G off the jack stands so my G was stuck off the ground with no way to get it down Had the wife drive me to Sears. They refused to exchange it and only had a 4 ton. So I had to buy that for $150.00 I've already emailed Sears customer service about the lower quality of Craftman tools. Their $hit is now made in China. I always thought that Craftman tools had a lifetime warranty? The manager (a young kid) told me that only applies to hand tools? I said wtf is a hydraulic jack. It has no motor in it. You have to pump it by hand. He said sorry. My wife dragged me away before I did a jack0 on him:angry7: In any case by 10:30 last night my G was back in the garage and I now have two hydraulic jacks. A 3 ton non working one and a new 4 ton. Maybe the 3 ton can be repaired, needs oil, not sure? I just wanted my G back off the #ucken jack stands. I replaced the cabin filter, changed the oil and filter, rotated my new tires that now have 6k miles on them and am going to change my air filter as soon as it gets a little warmer today. I figure I did a couple of hundred $$$ of work so even if Sears ends up screwing me on the jack I at least have a new one. If I can repair the old one then I'll have two for lifting both sides of my G.

Telcoman

[rn79870]

Wow, telcoman. "Working on your own car" sure sounds like loads of fun ... Glad, nothing/no one got hurt.

[goneracin]

Its not worth it to rebuild the jack. I had an old craftsman do the same thing to me and I went through the same deal at the store. It sucks. I think a rebuild kit is like $50. I have a craftsman aluminum one now. It is not uncommon to have to top off a new jack once you break it in. Don't panic if your new one "gives out" after a few uses. It just needs to be topped off with a little fluid.

Have you tried refilling your old one?

[tollboothwilley]

Wow, telcoman. "Working on your own car" sure sounds like loads of fun ... Glad, nothing/no one got hurt.

But it is such a satisfying thing when you do it right. Mess up, and its a different story...

[Jacko3]

Telcoman:

Sorry to hear all these inconviniences you experienced. well, corporate america is bent on shafting its customers. I feel your pain. I am glad you did not go Jacko on the store manager or sales man. spending an extra $150 for a resolvable matter is really annoying. Have a popcorn on me

BTW, don't go Jacko on those talking about the fuel grade. Ignore it. Lets transfer the heat elsewhere .

[Jacko3]

oldandslow:

Nice explanations!

[Jacko3]

SVTCobra:

You never know, I might just go ahead and buy you a grounding gear. You just never know! I don't want you to miss the joy of the G just because you have to send the kids to school.

[SVTCOBRA]

mustang is doing fine! Hasn't broken down all day! (also haven't driven it yet today )

I had a Sears brand floor jack poop out on me years ago and they did replace it with a Craftsman. I had to pay the difference cause the Craftsman came with a pair of jack stands.I had heard that the lifetime deal is just on hand tools.

Was at the local Sears recently to get a 5 drawer bottom unit tool cabinet to go under my other two. They had 4 in stock. ALL FOUR were damaged. I ended up getting the best of the 4 (slight crease on the side) for 10% off.Most of my tools are Craftsman & Kobalt

Glad you weren't hurt when the jack failed!! +100 for using stands!! (but have to take 1 back for 87 octane )

[Tampa G35 Sedan 6MT]

Wow that wasn't as interesting as i thought it would have been. I am still recovering from last night. Heavy and and then almost

91-93 for me.... I want all the HP i can get out of my G!

sorry to hear about the Jack at sears.. everyone has to cut back on stuff becasue of the bad markets... Sears just joined the boat!

DJ

[telcoman]

mustang is doing fine! Hasn't broken down all day! (also haven't driven it yet today )

I had a Sears brand floor jack poop out on me years ago and they did replace it with a Craftsman. I had to pay the difference cause the Craftsman came with a pair of jack stands.I had heard that the lifetime deal is just on hand tools.

Was at the local Sears recently to get a 5 drawer bottom unit tool cabinet to go under my other two. They had 4 in stock. ALL FOUR were damaged. I ended up getting the best of the 4 (slight crease on the side) for 10% off.Most of my tools are Craftsman & Kobalt

Glad you weren't hurt when the jack failed!! +100 for using stands!! (but have to take 1 back for 87 octane )

My old jack also came with jack stands



Things have not been going well for me since working from 12:30 AM Friday morning until Friday afternoon.



I just made a stupid mistake. After changing the air filter I forgot to plug in the connector near the MAF and started the car. Now the Service engine light is on.

I tried the reset procedure by pressing and releasing the pedal but I find the instructions a little confusing over what exactly has to be done five times in five seconds or seven seconds or 10 seconds..... who wrote that I may just go to the dealer tomorrow & let them reset it?

Telcoman

[telcoman]

Telcoman:

Sorry to hear all these inconviniences you experienced. well, corporate america is bent on shafting its customers. I feel your pain. I am glad you did not go Jacko on the store manager or sales man. spending an extra $150 for a resolvable matter is really annoying. Have a popcorn on me

BTW, don't go Jacko on those talking about the fuel grade. Ignore it. Lets transfer the heat elsewhere .

Thanks Jacko

See Jacko us NICO or is it NEEco or who gives a $hit members do think of you at times .I had better luck with my new new dual tuner HD Tivo last week when Comcast installed a new M card after csr told me they didn't have any. I took care of him $$$ & got a 15 db amp, a 8 port splitter a 6 port splitter, he reterminated all my RG 6 cables with new F connectors, and is arranging for a new cable feed into my house. As I've prevously written, always take care of service people and they will take care of you. (Except for Sears sometimes)

Telcoman