WASTE OF MONEY. Even the V6 3.0 only requires 87 octane. Read an article about octane before you make such a recommendation.
http://ask.cars.com/2007/07/premium-gasolin.html


Do you know how the AWD system works???
Unless I missed where the '10 GT recieved a different system then the '07-'09, that is NOT how it works.

 

From 2010 the v6 prefer premium and if you read the pump you will find that regular has 10% ethanol in it and premium none. My test give a much lower fuel economy with regular enough to offset the cost plus premium has a better cleaning package and 10 extra ponies.

Indeed the GT (XLS in Canada) has a different AWD system and there is no 2WD just 3 different schedule of front /rear proportion BitDawg is right.
Read this--> Mitsubishi Motors Newsroom
Download the Powerpoint presentation.

The only way to have 2WD on a GT is to have the system think your parking brake is ON by paralleling the Hand brake switch.

 

Like I said, IF the '10 GT has something different then.....

I didnt know that the GT and XLS actually got different systems, so I do apolgize for that. BUT, Lock mode does not mean, FULL lock. Its not a locking differential like most people think. And that is explaned in that PowerPoint along with my link.

Here is the info on the '07-'09 XLS:
http://www.autospectator.com/cars/mo...ishi-outlander

Mitsubishi's media.mitsubishicars site no longer has the older models info unfortunately. My link doesnt work, but that autospectator.com has some good info for how the AWC system works. 2WD is completely two-wheel-drive.

So is the GT models the only ones that recieved the S-AWC system??? Everything else is just AWC? This is for both XLS and Sport models.

10% ethanol doesnt necesarily mean lower mpg. Ponies it could effect in certain situations but questions come up like altitude, adjustable timing? High altitude states like Colorado use 85, 87, and 91. A vehicle requiring 87 can run 85 at high altitude with NO issues. Hey, its your money. Do what you want. More people think like you, but theres more articles saying its usually a waste...

 

S-AWC came in 2010 on US GT and it's cousin the Canadian XLS (2010-2012).

In 2011 it's the system on the GT but not the US XLS as it is a 2WD.
In 2012 it graced the US 4WD GT but not the US 2WD GT.

Lock only mean fixed transfer between font and rear no more variable like "Tarmac" or "Snow".
The Center and the front diff are controlled but the rear one is open.

As for Fuel Octane...
From 2010 the engine mapping on the v6 is made to use the premium fuel and the use of regular is covered by the use of a second set of knock sensors.
Not as optimized, as they are recommending premium in all the manuals.
My personal experience is showing little difference in cost but a discernible one in driveability. Mind you in winter you might like the ethanol as anti freeze for the fuel lines.
Also my previous cars, all Chryslers from 1994 up had a 8 to 10% better fuel economy on premium as the computer reacting to knock would give more spark advance. (a skeptical friend with an Intrepid tried it and came with similar results)

IMUO, article about octane are reprint of the time we had distributor with points and condenser I have yet to see one from a reputable source with numbers, if you do, please post me a link I am curious.