Worse meaning it will damage your engine over time and you will actually loose power.

The only benefit to a high octane fuel is that it allows an engine to run at a higher temperature and with a higher compression ratio without pinging. Higher octane fuel does not provide more energy, more power, better mileage, more torque, burn cleaner, clean your engine, and is not better for the environment.

If you run too high of an octane, you car will not be able to properly burn it. It will lead to increased carbon deposits and can foul your plugs and clog your catalytic converters. (especially the fools that run leaded race fuel).

 

8 lb/gallon? I would be careful there, it seems as though you are putting water into your gas tank.

 

I work at Costco's gas station and every time a G pulls in I hang around to see what they put in. A majority do it right and drop 91 but there's a few in particular that always put in 87. My heart cries when I see this...

 

^^^ thats about right...6-8 pounds per gallon...how much did you think LIQUID fuel weighed? How much the full tank weighs obviously depends on the size of the tank but those calculations are pretty spot on

 

Why? Many people run regular unleaded with no issue. Unless you experience knocking, there is no difference. Most new cars, including the G35 have knock sensors that automatically retard timing a couple degrees if any engine knock is detected. If this happens, you may loose a fraction of performance, but it would not be detrimental to the car. You run more risk of damage to the car running higher octane than recommended than you do lower.

Also the owner manuals for non revup sedans suggests 87 Octane.

 

I always opt for a 91 octane mix of Shell V-Power and Chevron w/Techron to get dat VTEC yo

 

Liquid gasoline has a density of about 6.3 lb/gallon. Not even close to 8 lb/gallon.

That fact alone should increase his quarter-mile time by nearly half a second...

 

nothing but 93 since day 1.

 

advanced timing calls for higher octane(ciphor adjusted)

 

but they set the timing to run 91 octane premium pump gas. So unless you got your engine tuned to run on a higher octane, using a higher octane gas is a waste of money, and is doing more harm than good.

 

I always use the highest. Bp, mobile, or shell

 

I run 100LL from the airport, Im a member there so i get it for $1.77/L

I run no cats, so lead does nothing but grease the bone

 

The lucas fuel treatment is working EXCELLENT agains5 pinging. I hear alot more grunt from the intake when I accel down low. I am curious to how it will hold in the next tank.

 

My mechanic, a close family friend, begged me to not even consider anything lower than 91 for my G. He told me of the horror stories of discovering the majority of G owners engine problems were from lower octane fuel. Choosing premium fuel is only 5-8 bucks more for each fuel up, that small toll is worth saving myself a costly headache in the future.

The sedan drivers typically choose Premium at my gas station. The drivers I was referring to were Coupe owners.

 

exactly.... its not worth the risk of blowing an engine over a couple dollars... if you cant afford to put the required fuel in the car you buy, dont buy it. go buy a escort.....yes, the ecu may retard the timing if it senses knock. problem is, all it takes is one bad batch of low grade for the ecu not to be able to adjust the timing enough and BOOM.....if you get a bad batch of premium, it will still be as good if not better than low grade so there is far less risk of detonation..... also, most people dont know what engine knock sounds like... it doesnt sound like an actual knock, it sounds, the best way i can describe it, crumbling foil in a can......and if your timing is getting retarded, you are losing performance.... another thing, everyone has heard plenty of horror stories of people blowing engines from using fuel below the manuf. requirements.... riddle me this, have your ever heard of someone blowing an engine from putting in 95 octane fuel in a car that requires 91? NO... anyone who uses low grade for extended periods of time on these cars and doesnt have issues down the road is just plain lucky, PERIOD....i dont care what anyone says, run what the cap says, and no higher octane wont harm your engine, unless you use something outrageous like 114... you could run 100 all day for the life of the car in these cars and it wont give you problems