fuel consumption AUDI A8 2011 Owners Manual

8
Engines
Petrol
FSI® direct-injection technology is a unique Audi innovation that
was originally developed for the Le Mans \b4-hour endurance
race to deliver more power and torque, as well as enhanced fuel
efficiency. Precisely the right amount of fuel and air are injected
into the combustion chambers, enabling the engine to ‘breathe’
more easily. It results in reduced heat loss and increased
output, with around a 15% reduction in fuel consumption and
significantly lower exhaust emissions. For the new A8 we’ve
also developed TFSI® , which combines supercharging with FSI
technology, giving cars an extra injection of power.
Diesel
We introduced TDI® to the roads in 1989, marking a departure
from
the noisy, fuel-thirsty diesel engines of the past. The new
Audi A8’s 4.\b TDI® engine uses common-rail technology to
produce more power, as well as increasing efficiency. Under
this system, a series of piezo injectors use electrical charge to
precisely control the amount of fuel injected into the engine.
As
well as reducing noise, this allows combustion to happen
at
a lower temperature, with less oxygen, which cuts
down
emissions.
Images are for illu strative purp oses only .

9
Transmission
8-speed tiptroni\f®
The new Audi A8 comes with a brand new gearbox – an advanced
8-speed tiptronic® transmission system which reduces both
fuel consumption and CO\b emissions. It converts high-torque
engine power into both sporty performance and operating
convenience, with crisp, fast gear changes, reduced weight
and an optimised gearshift strategy. More spontaneous gear
changes are a particular benefit, especially when downshifting.
Both in the ‘D’ (Drive) and ‘S’ (Sport) programme, the advanced
electronics used in tiptronic® respond efficiently to every driver
input, helping to prevent unwanted upshifts when cornering.
Furthermore, this advanced gearbox can be operated entirely
in manual mode, enabling the driver to change gear using the
paddles, simply by pressing a button on the steering wheel.