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27/08/2010
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The Lexus IS has undergone its most significant revisions since the current generation model was launched in 2005.
 One of the biggest changes is the introduction of the IS 200d, which delivers improved fuel economy, lower emissions and reduced tax bills. Elsewhere in the engine line-up, the V6 petrol engine featured in the IS 250 and IS 250C coupe-convertible with six-speed automatic transmission has also been revised to meet future Euro5 emissions standards, achieving better fuel economy and CO2 emissions with no penalty in performance.
The new diesel engine delivers stronger fuel economy, lower CO2 emissions and a more refined and smoother drive. The unit features a re-shaped combustion chamber and new-generation piezoelectric fuel injectors to give a more efficient, cleaner and complete fuel burn. Pressure in the common rail injection system has been increased.
For the 2011 model year the IS 250 becomes and automatic-only model, with revisions to the powertrain that ensure compliance with Euro 5 emissions standards.
Power and torque are unchanged from the super-smooth V6 are unchanged at 205bhp and 252Nm, but combined cycle fuel consumption improves from 31.7 to 33.6mpg, with a concurrent fall in CO2 output from 209 to 194g/km.
Similarly, the improved engine is also under the bonnet of the 2011 IS 250C coupe-cabriolet, with an improvement in combined cycle performance to 30.7mpg and a 6g/km reduction in CO2 emissions to 213g/km.
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Author
John Challen
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