Who is still using premium gas.
yeah gas has gone up 20cents in the past 3 days here. sucks, but i see the gas price per gallon when i go to a station....i still fill it all the way up and dont hardly see the total price (nor do i wanna see lol) i know it was around $54 when 93 was like 3.19/gal.
if this shyt keeps up maybe i'll kick down to 91, but nothin lower! right now reg is like 3.19 around here so i dont wanna know what prem is now and im right under 1/4 tank 
. and i have no choice but to drive as much as i do. home to work is 28 miles one way......ghey!
. and i have no choice but to drive as much as i do. home to work is 28 miles one way......ghey!
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Anyway; I would just follow what the car recommends, in this case, premium gas. The g35 is marketed as an entry level sporty/luxury car, even if you can buy a used one for a lot less now.
It would be like complaining that your 18"/19" rubber costs too much (maybe get a car with 16" rims?), or that your Brembo breaks cost too much to replace.. it's just part of the deal. (along with squeaks and bad gas mileage
)
The 05/06 6MT G coupes and sedans (revup motor) need premium because the engines can rev about 600rpms higher and have a powerband higher in the rev range. Higher rpm power typically means more heat in the upper rpms. Nissan recommends premium all the time for these motors.
For all other 1st gen G35s, you can safely run regular and mid grade with no damage to the motor. MPGs and power may or may not suffer. It really depends on how you drive. Drive like a grandma in cold weather and you may see better mpgs. Drive like lunatic in warmer weather and the mpgs will suffer as well as power.
Octane is simply a measure of a fuel's resistance to burn. The higher the octane, the more resistant it is to burn. No fuel is cleaner than the other. Higher octane fuels are typically recommended for higher compression motors because the higher compression and higher rpm powerband creates a ton of heat in the combustion chamber. A lower octane fuel may ignite without the spark which is called detonation and is VERY bad for a motor. Luckily knock sensors will react quick enough to reduce damage in most cases. The result is reduced timing and additional fuel to cool the combustion chamber. The end result is reduced power and mpg.
In colder temps, the air charge is denser and the engine is often operating at a slightly lower temp therefore you can usually get away with running a lower octane and will probably not notice the difference. It is quite possible under certain conditions, 89 could out perform 91+. As temps get warmer, it becomes more ideal to run higher octanes. If you drive below 4000rpms almost all the time and don't lug the engine, then you can probably get away with running non-premium almost exclusively.
For all other 1st gen G35s, you can safely run regular and mid grade with no damage to the motor. MPGs and power may or may not suffer. It really depends on how you drive. Drive like a grandma in cold weather and you may see better mpgs. Drive like lunatic in warmer weather and the mpgs will suffer as well as power.
Octane is simply a measure of a fuel's resistance to burn. The higher the octane, the more resistant it is to burn. No fuel is cleaner than the other. Higher octane fuels are typically recommended for higher compression motors because the higher compression and higher rpm powerband creates a ton of heat in the combustion chamber. A lower octane fuel may ignite without the spark which is called detonation and is VERY bad for a motor. Luckily knock sensors will react quick enough to reduce damage in most cases. The result is reduced timing and additional fuel to cool the combustion chamber. The end result is reduced power and mpg.
In colder temps, the air charge is denser and the engine is often operating at a slightly lower temp therefore you can usually get away with running a lower octane and will probably not notice the difference. It is quite possible under certain conditions, 89 could out perform 91+. As temps get warmer, it becomes more ideal to run higher octanes. If you drive below 4000rpms almost all the time and don't lug the engine, then you can probably get away with running non-premium almost exclusively.
My bf filled up at 3.41 two days ago and yesterday I filled up at the same place and it was 3.59 at the pump, but advertised as 3.61 on the sign. Why? I'm not sure what the total was, not like I really have a choice.
