My EV gets 4 miles per KWH. My 2014 leaf show's that, I've seen it cited as an average on the internet. Obviously analysis varies depending on the mileage you actually get. I'm seeing Teslas get more like 3 miles per KWH - larger cars = less efficient. How you drive can also affect your efficiency - are you running heat or AC? Going 40 or 70?
Interesting thing - larger range means carrying around a much heavier battery. So my 2014 leaf gets better efficiency than a fancy Tesla. But I can only drive it around town really.
To account for losses in charging, call it $0.04 cents per mile for the electricity - meaning worse than your stated 85% charge efficiency.
That means at $1.68 / gallon, you'd need to get over 42 MPG to be at the same efficiency.
So, right now, even with cheap gas, you'd need an ICE car at the high-end of fuel efficiency to tie or beat my Nissan Leaf.