Just filled my 04 Prius for the 23rd time. I put in 7.042 gallons and went 532 miles which equals 75.55 MPG!!
My previous best was a 70.7 MPG tank.
Some details: Mid Sept-Mid Nov with mild temps. Keep tires 44/42. Started tank in WY with my wife, our two mountain bikes inside and we were just returning from a month long trip through twelve states, but most of the driving was near Boulder/Denver CO. Generally speeds 50's and 60's. Took about a dozen trips on the tank. No mountain driving and no strong winds. Filled with three pip/bars. I topped the tank, adding as much fuel as I thought would not overflow. For almost the entire tank, the MFD showed over 70 mpg and ended with 71.3 mpg.
Current lifetime data is 11391 miles using 187.323 gallons= 60.81 MPG
Some more stats. My ending 75.55 MPG tank showed 71.3 MFD. Out of my 23 tanks, six times the MFD showed a lower reading than actual. And the majority 17 times higher gives me a lifetime MFD of 62.28 which is 1.47 mpg higher than my 60.81 actual or about 2% higher reading on the computer. Overall I would say my actual and the computer have been quite close.
I do expect my next tank to be significantly lower due to: colder Colorado winter; smaller fuel bladder , more shorter trips, perhaps filling up at a different pump/station etc.
I consider myself fortunate to squeak over 50mpg. My daily 45 minute commute is 95% of the mileage on mine and I have to watch how I drive to get those last couple mpg. Maybe I can do better in the winter here in Tucson as the A/C won't be running full-time!
Ditto Lizard. My absolute best 31 mile one way commute was 62.5 per the display. I know that my battery started out fully charged and ended showing about half capacity. The point is, I cannot imagine any way to boost it. If ever I get a 75 mpg or higher five or ten minute span, it gets countered by a 40 mpg span (or there about). I'd like to go for a ride with someone who can get a 75mpg tank full just to experience the drive. (They'd probably say my being in the car ruined it!!!) Not that I don't believe the posts; it just baffles me.
___You know 61.2 lmpg is just another great tank away
___Stealth, if you really really want a 70 + mpg tank or segment, it is available to you with a little setup, a little (I mean a lot of ) patience, decent temps, and a little hypermiling technique thrown in here or there for good measure.