Sussie,
My V6 is the 6 speed manual (NOT the Q4 auto). I can't think of anything worse than a auto Alfa Romeo, somehow to me it is a inconsistency in terms. The manual gearbox in the V6 was introduced to Oz in 2002 see [url]
http://www.fastlane.com.au/News_Alfa/6-speed_156V6.htm[/url]
Yes, the 2.5 ltr V6 manual is a stunning performer and, if you're an Afla Romeo enthusiast, the sound of the engine as you get above 5,000 RPM is pure entertainment (turn off the stereo).
Fuel consumption is quite reasonable. I use Pro-Ma Performance Products PT5 Plus fuel treatment to keep the engine clean, to enhance the octane and to improve fuel economy and the MBL8 Conc in the oil to keep the bottom engine lubricated and reduce friction, the enemy of power (I am a Pro-Ma Distributor, see my website [url]www.pro-masystems.com.au/motor[/url]). Fuel consumption is around the 9.5 to 12 ltrs per 100 klms depending on how you drive it of course.
My 159 is only the 2.2 litre 4 cyl but the power is 136 Kw (verses 140 Kw for the 2.5 V6 in the 156).
Cheers and God bless
Magnum