I usually share the carpool with a co-worker. I drove my PIP to workplace alone yesterday and today. The trip (one-way) was 17 miles. Yesterday I did it with MPG of 360. Today is new record--- 410 MPG! My trip is 17 miles --- 13 miles on freeway, 4 miles on local. When I arrived workplace, 0.5 mile left. I keep the speed like 59-62 miles. If it is downhill drive, the speed can be upto 70 miles without kicking on the gasoline engine.
That's great! Mine ends up in the 200's when I take the freeway route. Of course, taking the slower, scenic, back route today, my 17-mile drive was 999 MPG.