Inspired by another thread on here and to entertain myself on my commute, I decided to go for the best MPG without making any physical changes to the car and with reasonably conservative driving.
Filled up today when range hit zero. 464 miles / 13.88 gallons = 33.4 avg mpg. I did 100 miles on the highway at 72-74mph with traffic, I think that put me under 36mpg for the tank.
I'd need to average 36mpg to hit 500 miles with indicated 0 range, maybe I'll try that on the next tank. Maybe some weight reduction / tire pressure changes too. And more drafting.
My best 30 mile commute average was 40.0 mpg. This was on 55mph stoplighted roads, I hit all the lights at the right time.