A t1d friend of mine (about 6 foot 6 inch and lean) uses 60u Lantus every day, which we find shocking compared to my 22u and lives with his bloods around 10mmols.
Tresiba? The consultant I saw on Thursday rated basals with Tresiba being the no1 and not a lot of difference between Lantus & Levemeir, but says it won't work for everybody....