I've put in my first tankful since picking it up on Monday night-put on 300 milles this weekend.

On the tank of what the dealer had in, according to the computer, I got 27 mpg. I filled up on regular for the return trip and got 24 mpg.

It might b e cost-effective to use the higher octane.

Around here, there is 1 gas tank farm,and all (BP,Shell, Mobile Kwiktrip, ect all comes from the same tank farm. The Holiday stations from the UP come down here to get product.

 

87 for me, usually from costco. I get about 420-450KM before I need to fill, which is about 1/4 tank left. seems pretty decent for an 08 outlander.

 

87 here. That's what my engine is spec'd for.

Higher octane does not mean more performance from the fuel alone...it means fuel does not combust as easily.

 

so does that mean the higher the octane = better mileage?

 

no. The higher octane would benefit from the higher compression of 2010+ V6 models, the higher octane lets the ECU run more advanced timing and generate more torque using the same amount of fuel, which means your have a little better gas mileage.

 

Exactly right. The only con is that the fuel is more expensive.

To use higher octane, you need higher compression. Vehicles with turbos and superchargers will use higher octane.

 

I have a 2007 if I was to put higher octane in my car when I get better mileage? Or it wouldn't matter. If not mileage boost, what about performance?

 

No. If your engine iis spec'ed for 87 octane, then the premium would not help mileage. If your engine is "recommended " to use premium, then maybe.

 

Still six that the mpg or kpt is so low, I'm tempted to put a engine transplant in with that kind of consumption!! Otherwise I'll try flash my ecu with a different map first and curb some excess fueling mitsi gives and dyno it before and after and with the manifold system etc