As I mentioned in another thread, I am pretty seriously impressed with the gas milage improvements in the 2015 TLX SH-AWD vs my old 2010 TL SH-AWD.

I just did my first fill up, and I averaged 24.14 mpg (9.7L/100km) in a mix of city and highway milage with some very cold days. (and I only used eco the first snow storm day)

The absolute best I ever did in the old TL was 26.6 mpg in 100% highway driving, and the 4 yr average on the old TL was 19.04 mpg...

So if this keeps up I am looking at a 5 mpg improvement.

 

My first tank for my 2015 TLX SH-AWD Elite was not as impressive as yours, but nonetheless still excellent by any standard. Mine was 10.5 L/100km or 22.4 mpg with mostly local driving. I used to get about 11 L/100km with my 2012 TL SH-AWD Elite. That means my first tank with the TLX SH-AWD is already better than the average fuel consumption of the TL SH-AWD! That is quite something.

My best highway fuel consumption with the 2012 TL SH-AWD Elite was about 29 mpg or 8.1 L/100km, which was pretty good. I expect that the TLX SH-AWD will be much better than this.

Now I am on my second tank and the gas mileage continues to improve!!! It's pretty impressive, given that this is a 3.5L, AWD vehicle!

 

I avergaed 9.0 on my first tank in an i4. Which is rubbish compared to what my TSX got - 7.0 lifetime. But conditions have been awful so too early to tell. Last night, on a 34 km run, after just filling it, in perfect conditions it got an incredible 5.0. But there was a net 700 feet altitude drop which helps. a lot. Far too early to gauge much but feeling so far that is in regular driving it is about 10% down on the TSX MT, but maybe better when conditions are perfect.