According to Motortrend on the 7 Series, the ActiveHybrid system improves performance versus the 750i, reducing the 0-60 time to approximately 4.8 seconds, while offering about 15 per cent better fuel economy.
Other advantages include an idle-stop system, which makes town driving more peaceful, and an electrically driven air-conditioner that can run for 30 minutes without the engine.
BMW sources say the hybrid system can be added to a car for about €5000 ($7500). The gap between the 7 ActiveHybrid and the standard 750i is greater than that, but the feature content of the hybrid is higher.
It said, ”It is for cost reasons that BMW has no plans for a diesel hybrid - clean diesels are expensive engines. Diesels are in any case economical at light load, which is the mode where a gas engine needs the help of hybrid.
”Also, the company is currently selling in Europe a 3 Series diesel with 163 horsepower and 8.2-second 0-62 mph performance that matches the Mk2 Toyota Prius for CO2 emissions. An engineer explained that hybridizing such a car would add several thousand dollars to its cost while saving the driver just $150 a year, even at Europe‘s high fuel prices.”
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