Well, this is probably only in Canada. Well, I would say the new calculation is much more closer to reality.

14 RDX:

FUEL ECONOMY City – AWD with Intelligent Control System™ 10.7 litres/100 km†
Highway – AWD with Intelligent Control System™ 7.3 litres/100 km†
Combined – AWD with Intelligent Control System™ 9.2 litres/100 km†

Based on 2013 EnerGuide Fuel Consumption Guide ratings published by Natural Resources Canada.
Transport Canada approved test methods used. Your actual fuel consumption will vary based on driving habits
and other factors – use for comparison only.

15 RDX:

FUEL ECONOMY
City – AWD with Intelligent Control System™ 12.1 litres/100 km†
Highway – AWD with Intelligent Control System™ 8.7 litres/100 km†
Combined – AWD with Intelligent Control System™ 10.6 litres/100 km†

†Estimated fuel economy based on Government of Canada’s new 5-cycle testing method.
Your actual fuel consumption will vary based on driving habits and other factors – use for
comparison only. For more information on 5-cycle testing, visit
http://www.nrcan.gc.ca/energy/effici...ks/buying/7491

 

That doesn't speak to any actual differences in the cars - only to the fuel economy testing criteria.

Realistically, it will help dealers clear out the 14's as they "get better economy" over the 15's.

 

The new measurement is much closer to what I am getting. I don't get 12.1L/100km (22mpg) on my 14 RDX

 

8.5L/100KM though the mountains - my 15' window sticker said 8.7L, first time I've ever gotten better than the stated fuel economy.

 

actually i mean i don't get 10.7L/100km on my 14 RDX.. it's in high 12

 

I regularly get 8.5 to 9 litres per 100kms.

 

thats very nice. do you drive lots of hwy?

 

Hmm, I haven't seen those '14 numbers before. The window sticker on my '14 when i bought it said 12.1 / 8.7 / 10.6. The first couple thousand km was higher than that, but thats understandable with new engine + winter temps + winter tires. Ever since, those numbers have been fairly realistic. On my current tank with about 50/50 driving, maybe a touch more hwy, I'm sitting at 9.6