Speed Limits in the US

[freaksister 0]

OUCH! what a dumbass...I told ya stupid people are still reproducing! good grief
Sis
Can you Trip like I do?

[AndyMan 7]

It depends on what the car is designed for.
The fuel economy on my Prelude takes a nosedive if I put anything less then 91 in.
I once put 87 back when it was up over $2.00, then after a three hour trip the car burned more gas - it actually cost me more then had I just filled up with the 93.
You can actually damage the engine by putting in less then recomended octane. Honda's are good though, they'll electronically adjust the timing to handle the lower octane.
If your car isn't designed for high octane fuel, there simply isn't any point in buying it. It's not going to make your car go faster, get better fuel economy, or run better.
It tends to be european and japanese sports cars that need the high octane. American sports cars rarely need it, and will rarely take advantage of it.
_Am
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[skycat 0]

Well since I've put 106,000 miles on it, I think it is working out just fine no matter what octane I put in. No matter what car you drive you can tell a difference in gas milage if you really pay attention to it. Even my old Sunbird used to get much better gas milage with 93, but I was a poor college student so 87 it what it got. My friend with a cobra and supercharger had to use octane enhansers every fill up cause it ran like shit without it.
Now as for the diesel example it doesn't apply. If I put diesel or leaded in ofcourse it's going to ruin my engine. I know I'm a girl and I'm sure you think I don't know jack about cars, and it is so tempting to pat me on the head and tell me I probably don't even know what kind of car I drive that you are sure I'm mistaken that it is a V6 and not a big mans V8, but I've been under the hood of a car since I was able to push the step stool up to it.
btw....yes mechanics get really pissed at me when I call bullshit on them when they are trying to rip me off. Or heaven forbid I actually tell them what is wrong or what they should do to it. As I'm telling them to give me the keys I'm going some place else, It is quite entertaining to watch them back pedel. Another one is the like "What's a little girl like you doing with a big car like that? That is just way to much power for you."

[GrumpySmurf 0]

Quote

My friend with a cobra and supercharger had to use octane enhansers every fill up cause it ran like shit without it.

My understanding is that the higher octane are more resilient to pre-detonation, often refered to as 'knocking'. Alot of the newer cars today have sensors to detect knocking and will reduce the advance curve to compensate - which in turn reduces power output. Often you will find 93 octance cars have 4 valves per cylinder head with the exhaust ports REAL close, and the space between them can get really hot, which in turn can cause the gas to detonate too early. At least that's how I understand it.
The downside with your friends Cobra is that it most likely lacks the electronics to pick up on pre-det (for the mods that have he/she has had done), and running higher octane will not only help the engine run better, but help it live longer as well - since extended pre-det can cause degredation around the exhaust valves, then you got big trouble.
So if your engine is designed for 87, running 93 will do nothing but chew up your bank account. I was curious to see how sensitive the Mustang is to knock, haven't had much experience with American cars aside from the old mans '67 Vette.
Any chica that can understand the basics of an internal combustion engine and change her own oil (or especially if she can swap out brake pads or install a short shift kit) gets a serious thumbs up from me :)

[skycat 0]

hehe...if I had the tools I would do all the maintenance that I can, but alas I don't have to tools so I must take the bitch to mechanics. Well and I really hate getting all dirty, and grease gets everyone and then you get all smell.....yucky!! Sorry about that rant earlier I had to fight with the guy that I didn't need new back tires only front ones, the back ones have tons of tread left. After the new ones were on there is only like maybe a 1/4 inch difference in tread....dumbasses...

[Kris 0]

Quote

If your car isn't designed for high octane fuel, there simply isn't any point in buying it. It's not going to make your car go faster, get better fuel economy, or run better.
It tends to be european and japanese sports cars that need the high octane. American sports cars rarely need it, and will rarely take advantage of it.

Yup, my Hyundai (Yes, I said Hyundai) Tiburon runs like crap on low octane gas. Give her 91 and she comes alive and eats Camaro RS's and stock Mustang's for lunch. The Beta engine in mine has a compression ratio of 10.3:1 so that's probably a big part of it.
Kris

[FallingILweenie 0]

Speed limits are just suggestions anyway, like those national park signs or the signs telling you you can get gas and food at a given exit.
blue skies
Tomas