The "fleet-wide" note is
The "fleet-wide" note is important.
Most medias will simply spread the news as "Mazdas are more efficient" but when you apportion the numbers in the study, you get :
For cars :
Toyota 31.4 (advantage hybrid here ?)
Honda 30.4
Mazda 30.2 ("Skyactive" showing yet potential in traditional engineering ?)
Nissan 29.8
Subaru 28.6
Ford 28.0
AVERAGE 27.9
VW 27.6
BMW 26.7
GM 25.5
FCA 24.0
For (real) trucks :
Toyota 19.8
FCA 19.7
AVERAGE 19.4
Ford 19.3
GM 18.8
Basic line is japanese brands still lead the pack while US brands are still lagging despite a more technological approach (turbos, DI). Hyundai's and Kia's figures are not available pendign revision (and not Ford ?) but would be middle of the pack.