Our 2015 SEL came with worn original Contis in the back and fairly new Fuzions (lower tier alt brand Bridgestone) in the front. I suspect the fronts were put on either just prior to lease turn in or at the VW dealer we bought the car from. With no baseline I am not sure how much the Fuzions in front are affecting range, but at 44k miles we still see 80-100 miles driving the eGolf like a normal car. I will say this about the Fuzions (which I don't like much but can't really complain about too much I guess) is they lose air a lot faster than the old worn Contis.
My plan was to replace all four tires as soon as the Contis get close to their wear bars but after close to 13k miles of our ownership my patience is wearing thinner than the rear Conti's tread depth seems to be.
Based on a recommendation from an Audi forum member I put General Altimax RT-43s on my 1986 Audi 4000 quattro a year or so back. There are very few good choices remaining in the stock size for that car. So far I am beyond impressed and despite not being sold as an "eco" tire they do offer lower than average rolling resistance according to TireRack.com tests so I am seriously considering these for the eGolf as well. They are reasonably priced from internet tire vendors such as Discount Tire Direct (via eBay) and Costco installs for $60 per set.
General is an old US brand name that is now owned by Continental. I liked the RT-43s so much I just put UHP all season G-Max AS-05s on the BMW 540i wagon and so far they are outstanding. Better than the worn Michelins they replaced by far. (But not a fair comparison due to age differences.) The RT-43s are made in the USA and the G-Max are made in Germany. I guess their old marketing slogan came true, sooner or later I owned Generals. (I actually had another set of Generals that were OEM on a new 1992 Ford-F150 I bought back in January 1993.) Normally I stick with Michelin or Bridgestone, but I have been swayed of late.
I wonder how much difference in real world range between RT-43s and Ecopias, etc. really is? Efficiency is not my top criteria in tire selection normally and reviews indicate to me that eco tires (like run flats) pretty much suck at their price point.