Unleaded Plus vs. Unleaded Premium

[blue2000s]

Originally Posted by Lil bastard

So far as Calorific, BTU or Joules are concerned, generally speaking, lower octane fuel contains more energy than higher octane fuel.

The key here is "generally speaking" because there are various mixtures used to boost fuel octane and they don't all decrease the energy content of the fuel.

[Lil bastard]

Originally Posted by blue2000s

The key here is "generally speaking" because there are various mixtures used to boost fuel octane and they don't all decrease the energy content of the fuel.

Exactly... There are fuels which contain more energy and higher octane, but these are usually special concoctions costing much more and not generally available at the pump.

[Benny986]

the higher octane is primarily to run more timing. lower your timing down, and run all the 87 octane you want. the car can automatically retard timing, but only so much.

but why would you want to retard timing when you own a porsche, to save a couple of dollars/fill-up?

on the flip side, if you run higher octane, like 100, etc. then bump the timing, and get more power : )

[6speed]

Thats what porsches " knock sensor (TM) " does !

[Brucelee]

Unfortunately the number one factor is our right feet.

Boy, you got that one right!

[PSL-Boxster]

Originally Posted by Brucelee

Unfortunately the number one factor is our right feet.

Boy, you got that one right!

double true -- i have the tiptronic option which helps with mileage more then i thought it would initially

[Rob-00BoxsterS]

Sorry to go OT but I found this interesting:

I also own an old Nissan 300ZX turbo and frequent a few Z31 sites. A thread was started almost identical to this one on one of those sites and I pretty much did a cut-n-paste from my above written posts.

Instead of respectfully pointing out the flaws in my data collection or seeing how the data could be beneficial to them (like what was done on this site) they turned it into a pissing match on what octane ratings mean. I was also called stupid for trying to say I know the car better "then the people who made the car from ground up and tested it's flaws.” (<= direct quote from that thread.) The data was ignored while the members there competed in a game of "Who has the bigger e-penis."

This forum and the Land Rover forums are the only two I have been on that show respect to their fellow members and talks to them like they would if they were face to face. It's very refreshing.

**Note** This post is not meant to bash on other sites, just to compliment this one. Unfortunately, this site provides no information on my other vehicles no matter how hard I search so I do need to continue to frequent them.

[6speed]

Originally Posted by PSL-Boxster

double true -- i have the tiptronic option which helps with mileage more then i thought it would initially

It's the other way around PSL . No disrespect but , the manual tranny gets the better mileage and 0-60 times.