Here we go,
the development of 0w8 oil by sae, lol. I wonder if the sae been watching this thread because we had the anti friction properties of moly nailed down for more then a decade. Kinda funny though, they want to increase CA meaning it wont be di friendly. So they develop an engine that increases fuel efficiency by 20% and then develop an oil that increases efficiency by .8% but you cant use it in the former? DI turbo's are the real deal, they will give you mpg if you are matching power numbers, as in 400hp di versus hemi. However, of note the ram v6 is
best in class fuel mileage, and gets a whopping 19mpg?
from link..
Further fuel economy improvement of the internal combustion engine is indispensable for CO2 reduction in order to cope with serious global environmental problems. Although lowering the viscosity of engine oil is an effective way to improve fuel economy, it may reduce the wear resistance. Therefore, it is important to achieve both improved fuel economy and reliability. We have developed new 0W- 8 engine oil of ultra-low viscosity and achieved an improvement in fuel economy by 0.8% compared to the commercial 0W-16 engine oil. For this new oil, we reduced the friction coefficient under boundary lubrication regime by applying an oil film former and calcium borate detergent. The film former increased the oil film thickness without increasing the oil viscosity. The calcium borate detergent enhanced the friction reduction effect of molybdenum dithiocarbamate (MoDTC). By applying these technologies, an engine oil was developed which successfully achieved desired fuel efficiency and reliability. The developed oil also met the new JASO GLV-1 specification.
The JASO GLV-1 specification is a Japanese invention on fuel mileage, and guess what their secret is? You guessed it low visc but high moly.