My wife and I both have 08' prius. She has 11700 miles on hers and is running mobil synth 1 oil. Our tires are inflated the same (37.5 front 35 rear). Mine only has 2200 miles on it and has the starter oil from toyota in it. My oil level looks like its a little above full on the dipstick (maybe 1/8 inch) - why that would be I don't know because her oil levels were perfect when the car was delivered. She is getting regularly 51-53 mpg and can't be bothered with pulse glide or stealth warping techniques. I get tops 48.5 MPG and occasionally do some hypermiling strategies. She also makes longer runs than I do but I definitely get out of the 5 minute range and into fuel efficiency range. I'm guessing that her mileage is better than mine because her prius is much more broken in than mine. I can't remember how hers did when it had similar amount of miles on it as mine. Could the break in make that much difference ? I would think that her different routes and type of routes might be helping as well. Does 48 MPG sound right for a prius with 2200 miles on it ? I'm not complaining because I got 16 mpg on my last car but was wondering why she is doing better than me and does nothing special driving habit wise.