For those who may be interested... for the first 30,000 miles, our 2010 Prius has averaged 47 mpg in mixed driving. The fuel mileage does not fluctuate very much from tank to tank... low 40's (city driving or into a headwind) to low 50's (normal highway driving under 65 mph). Fuel mileage drops to upper 40's when cruising on the interstate at 70 mph.
Message Posted: Mar 16, 2013 7:40:37 PM
Our 1996 GMC Suburban Diesel averages 19 mpg in mixed driving. The fuel mileage also does not fluctuate very much from tank to tank; and with a 42 gallon tank, highway cruising range can exceed 800 miles at 20 to 21 mpg.
[Edited by: whaleiii at 3/16/2013 7:46:14 PM EST]