This is the last 7 months on the 265's. 261 wh/mi over 16,958 miles. Before temps dropped last month I was at 252 wh/mi. Sub 50 degrees and my highway efficiency is 280 to 310. I am due for another set in the spring when they go back on. I got about 32k miles on the 265's.
Michigan is pretty flat which helps. My commute for work is 45 miles one way and mostly highway. The rest is 50mph country roads. I run 42psi and alignment is +.1* toe front and rear and -1.6* camber front and rear dropped just below MPP recommended height.