Quote:
Originally Posted by mit_peid
It is not that simple. Depends on a whole lot of other things, but D4S kicks in and generally uses more gas (not less) to generate even more HP with higher compression. I can get very good highway mileage too at 65-70mph while in 6th on flat highway (35+mpg). The best mpg I got was during my break-in period when I was trying to stay under 4000k.
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I can understand that it uses more gas but it also has a variable timing difference at the point D4S kicks in, it seems like an efficient driving style to also let the engine breathe in some cases, as the engine and drivetrain seems to get smoother in a higher rpm range (at the cost of being really freakin loud sometimes.