I'm now 95%+ sure that it's going to be damned hard to get 600kms from a 34l tank. I've just done two seperate trips where the 500km mark has seen the light come on (that translates to under 6l/100, so around 48mpg) and though FIS has told me "750km!" - yeah, right, that 500 is a realistic limit. That's with minimal climate usage (auto, 21C, freshly charged with gas, 16C outside), lights where necessary, wipers if needed... no stereo etc and 80 or 100 limits with 50kms of motorway.
average speeds are around 60km/h, and the long term average is around 6.2l/100, over around 10k kms.
- Bret