Had a few laps round Silverstone over the weekend on and off the server, mostly between 1:18 and 1:20 in the Renault, Ferrari, Ligier, Lotus. Just had another drive offline in the Ligier with a developed setup and hard tyres with default fuel and I'm just scraping into the 1:15s.
I think it's going to be one of those mods where lots of practice time = huge improvements in laptimes.