The upgraded all-alloy V6 engine reduces noxious tailpipe emissions* assisting petrol Commodore Omega and Berlina variants achieve the highest Green Vehicle Guide noxious emissions score possible (8.5 points out of 10), excluding electric vehicles.

The noxious emission levels meet Euro VI certification, a standard which does not come into effect in Europe until 2014.

The improvement in efficiency and noxious emissions sees petrol Omega and Berlina models achieve an overall Green Vehicle Guide score of 13.5 points, giving these models a 3.5 star rating.

“The upgrade to this V6 engine was to enable improved fuel economy and reduced emissions without sacrificing real world performance,” GM Holden Director of Powertrain, Ernie Tamburrini said.

Fuel consumption (ADR 81/01) of the petrol Commodore sedan is reduced by 0.2 litres per 100 kilometres and the Ute and Sportwagon by 0.4 litres per 100 kilometres.

The engine upgrade will provide the most benefits to drivers looking for an alternative fuel option, with dramatic improvements on LPG converted vehicles.

Fuel efficiency (ADR 81/01) of the LPG Commodore sedan improves from 15.5 litres per 100 kilometres to 14.2 litres per 100 kilometres.

With the introduction of the upgraded engine, LPG customers can enjoy the benefits even sooner with petrol-only run-in distances halved to just 500 kilometres.

GM Holden recently reduced the cost of its dual fuel LPG system by $1,500 on Commodore Omega, Berlina, and Omega Ute. This means for private buyers eligible for the $2,000 government rebate, the net cost of an LPG Ute would only be $1,400 more than its petrol equivalent and only $400 more for the LPG sedan.

The monthly LPG conversion rate will increase in November to meet growing demand.

The petrol engine in the Omega and Berlina models delivers peak power of 175 kW at 6,500 rpm and peak torque of 325 Nm at 2,400 rpm and is matched with a four-speed automatic transmission.

The upgraded Alloytec V6 engine will be standard on all Omega and Berlina Commodore, Sportwagon and Ute variants from November production.

On sale now, the upgraded V6 engine will deliver the following improvements:

	Fuel Efficiency l/100km NEW	Fuel Efficiency l/100km PREVIOUS	Improvement l/100km	Co2 Emissions g/100kms NEW	Co2 Emissions g/100kms PREVIOUS	Improvement g/100km
Commodore: - Omega - Berlina - 60th Special Edition	10.6	10.8	- 0.2	252	256	- 4
Sportwagon: - Omega - Berlina - 60th Special Edition	10.7	11.1	- 0.4	256	261	- 5
Ute: - Omega - 60th Special Edition	10.9	11.3	- 0.4	259	268	- 9
Commodore LPG: - Omega - Berlina - 60th Special Edition	14.2	15.5	- 1.3	230	252	- 22
Ute LPG: - Omega - 60th Special Edition	15.1	15.7	- 0.6	244	255	- 11