I today refulled my car again - 34,9 litres that carried my i8 498 km. There was about 60 km range left during refuel. So very close to 7,0 litre per 100 km. I used charging at home to diminish gas consumption. Range of the car is seen in dashboard all the time but it goes down and up all the time. Don't know about algorithm. With some battery aid & full thank you should easily reach 550 km, maybe 600 km. I drove a lot of local freeways (at 130 km/h) with this latest tank.
With pure eDrive you can drive this car around 25-30 km with full batteries. I didn't measure it accurately today, but I'd say that the car run today about 25 km with batteries only. Maybe I can reach 30 km if I really try and calculate accurately, but not much more. I really like eDrive...it's elegant and knowing that there goes no gas is great. You can easily take your car downtown and home with full battery. With no gas at all
eDrive is fast enough in town, you can't push i8 faster in normal traffic than eDrive can provide. In traffic lights I noticed a small, nonsignificant slip on wet tarmac, but remembered then, that eDrive is front only. With that in mind, front keeps traction very well.