question about gas????

[joker_ca]

Ok i live out here in cali and gas is really getting expensive so what is the freaking difference of:
regular 87 - middle 89 - performance 91
i have a midsize suv v6, i put "89" could i go down to regular? Alot of my coworks say all the gas is the same

 

[takia]

GMC reccomends the LOWEST grade of gas for my vehicle, so cheaper is better for GMC. It may just depend on the mfg. of your car (i.e. Audi "requires" the highest). I did ask my mechanic about this though, and he agrees with your friends. The grade does not really matter that much.

 

[broncofish]

Over the years the only cars I have owned that required high octane gas were sports cars, 300zx Probe Mustang Camaro. My truck and family cars were cool with 87. As a matter of fact I drive a 2000 pathfinder and an 86 bronco and they both do fine on 87octane

 

[sato]

You would be completely fine with 87,
THe only reason to use a higher octane would to get more power out of your vehicle, if your compression is good enough.
Although ima Fish guy not a Car guy so dont take my word for it completely.

 

[moto757]

it has to do with the motor higher compression ratio's require more oct to make the cycle of the engine complete if they detonate early the knocking can occur which is running the cheap stuff if you are not running a turbo or super charger or a high compression motor then don't worry but yes there is a difference in gas it isn't just a conspirency

 

[simm]

Its like saying high mileage engine oil is better for high mileage cars versus suv oil or off road oil. Its all the freakin same to me. Its just OPEC getting you to buy more. Kinda like changing oil every 3,000 miles. Its an OPEC thing..

 

[tangman99]

There is a difference, but moto757 hit it on the head. It has to do with engine compression and not having preignition. Both of my cars (Corvette and BMW530i) both take 93 octane premium gas. I put 89 octane in my Corvette once when the station was out of premium. It ran fine unless I pushed hard throttle then the valves sounded like a diesel engine.
If a manual only calls for 89, 87 should be fine. You will lose a little power, but nothing that you could tell. If you get preignition, you will know it. It won't hurt it, it's just irritating as hell.

 

[loopy]

oh, darn.........thought you were gonna be posting about farting.
Rats.

 

[chainsaw5vent]

Originally posted by TangMan99
There is a difference, but moto757 hit it on the head. It has to do with engine compression and not having preignition. Both of my cars (Corvette and BMW530i) both take 93 octane premium gas. I put 89 octane in my Corvette once when the station was out of premium. It ran fine unless I pushed hard throttle then the valves sounded like a diesel engine.
If a manual only calls for 89, 87 should be fine. You will lose a little power, but nothing that you could tell. If you get preignition, you will know it. It won't hurt it, it's just irritating as hell.
true true

try 1 ton chevy 3500 15 pass van. 75 bux to fill up, 300 miles to the tank.

mama's bus. next yr, something a little more efficient so she can zip and rip around town in.

:happy:

 

[cjason3041]

use the cheapest gas your car will run on duh!!

 

[chainsaw5vent]

:thinking: has anybody out there tried the "tornado" type products for their car? what were the results?:notsure:
i just got back from kragen where they were on display and they state 1-3 mpg increase?
true??:notsure:

 

[moto757]

those things are a joke don't waste money just clean air filter make sure plugs are fine and wires and fluids i.e trans.,engine oil,diffs are all serviced and your car will run fine maybe try a better fluid such as amsoil or royal purple

 

[neonnate]

Originally posted by simm
Its like saying high mileage engine oil is better for high mileage cars versus suv oil or off road oil. Its all the freakin same to me. Its just OPEC getting you to buy more. Kinda like changing oil every 3,000 miles. Its an OPEC thing..
high mileage oil just has different additives and detergents to prevent sludge buildup.

 

[neonnate]

Originally posted by TangMan99
There is a difference, but moto757 hit it on the head. It has to do with engine compression and not having preignition. Both of my cars (Corvette and BMW530i) both take 93 octane premium gas. I put 89 octane in my Corvette once when the station was out of premium. It ran fine unless I pushed hard throttle then the valves sounded like a diesel engine.
If a manual only calls for 89, 87 should be fine. You will lose a little power, but nothing that you could tell. If you get preignition, you will know it. It won't hurt it, it's just irritating as hell.

Preignition, pinging, detonation whatever you wanna call it is very bad for your engine it produces high temp's and can melt pistons, cylinder heads etc.. What happens is the fuel mixture ignites before it is supposed to due to high heat in the combustion chamber. The higher octane fuel is more resistant to preignition.

 

[neonnate]

Originally posted by chainsaw5vent
:thinking: has anybody out there tried the "tornado" type products for their car? what were the results?:notsure:
i just got back from kragen where they were on display and they state 1-3 mpg increase?
true??:notsure:
junk dont waste your $. How do they figure a restriction in the air intake will save gas?

 

[cubfan]

87 works great for my volvo s40 soft turbo. never had any problems. if i could get it to run on spit, i would!!!