Is this crazy high gasoline mileage!?!?!

It is an amazing car.

 

75 is certainly possible, though its on upper limits. This is what hyper-miling is all about. You may have hyper miled without realizing it. If you need avg joe's mpg, then you can keep climate on, and do a full loop of 50 to 100 miles to see what you get. I would guess 52 to 55

 

the computer is not accurate, sorry.

 

So yer not in an 08 prius but a prime?

 

3rd gen BS's 7.5%, compared to calculated, in my experience. 4th Gen is doing really good though, a big improvement. Compare the gens on Fuelly.

 

I average 53 mpg and over 500 miles on one tank. I have a 2013 PRIUS C. I love this car!

 

That's great! The computer is a little optimistic though.

And as @Lucifer hinted, you might want to update your profile to avoid confusion.

 

I'd certainly say that number is realistic especially if you are driving with a charge on the traction battery (although you posted that you reset your meter when you deplete your EV range). In my experience I usually get around 65 MPG on the highways (all EV on back roads) so if your doing back road driving as well I can certainly see this number climbing higher.

As other have pointed out the computer is probably overestimating a bit but its still superb number so I wouldn't complain.

 

Sure. I see it all the time.

Of course in those conditions a full charge approaches 40 miles range

 

Elevation! On my way to send kids which is 9 miles mostly freeway, I got 90+ mpg to there and 38+mpg back to home. Average is more than 60mpg.

 

Something is not right in your numbers.

If e.g 100 mpg there
40 mpg back
Then the average mpg is 100/1.75 = 57.14*

It is tempting to take the sum of numbers and divide by two but that gives the wrong answer because it ignores weighting.

*
x amount of fuel there that works out to 100 mpg
2.5 x amount of fuel to return
Thus average of (1x+2.5x)/2 fuel each way

 

Your calculation is correct! It is not simple average. My math skill is rusted.

Given a lot of hills 54.5mpg is more practical. In EV mode I got 5.5m/kWh for the same route.

 

Even the regular Prius can achieve 65-75 MPG under the right conditions. In the regular Prius we usually see that sort of mileage under mild temps and when the battery stays around 58-62% SOC. I really would love to trade up to a Prime one of these days but I need to wear out my current Prius...which hopefully takes a long time.

Also, knowing the terrain you could switch to EV when needed, like climbing a hill... I'm sure a hypermiler has come up with a strategy to get the most out of their Prime.

That all being said it is another reason to like summer time. This morning on my 18.5 mile commute to work we had 55 F degree temps and got about 74 MPG from a cold start (regular non-plugin Prius). I'll probably get about 60 on the way back this afternoon.

 

I easily get 1000 miles a tank, with ICE to charge. Today I reverted back to EV mode. What this means is mostly EV operation with ICE coming on only when needed. Computer determined. So for a 42 mile round trip, the car traveled
about 38-39 miles in mostly EV. on freeway keep speed 55-60, if a truck comes along I’ll semi-draft the trailer at about 60 mph. Use radar cruise control. I’m of the impression that with this incredible MPGe I may even eke out 2000 miles for the tank. Next test.

 

No matter what generation, the MPG is MPGe and is only a guide. There is no accurate way to separate ICE use from HV and get accurate figures. Possibly under laboratory conditions but even then minute errors could appear. But the cars figures are good enough to shock the unitiated. ( the non-Prius driver )

 

Some observations about my trip yesterday. Set on Eco and full charge showing about 34 miles available ev range. This is a round trip of 105 miles- partial city and partial freeway. I make this trip all the time. The car registered a total of 92.50mpg. for total trip. I started out in hybrid mode for the partial city route and I noticed despite the hybrid setting the car was mainly driving in ev mode all the way to the freeway. I am thinking when the car is fully charged the vehicle is telling the computer it cannot accept anymore charge from the ice therefore it keeps it in ev mode driving up my mpg. there are sections of my trip I manually change to ev mode during stop and go 40-50 mile per hour zones. There seems to be a noticeable mpg increase saving a full charge in this way. Normally I was getting 82mpg on the trip using ev mode immediately and gradually running the battery pack down only during none freeway driving. I hope this makes some sense but obviously I used very little fuel with this technique, figuring it makes almost a 10mpg difference . I Noticed the car was reporting 84;5mpg. on the return trip only with more of the normal hybrid engine cycle on and off. By the was the air was on eco mode with 72 dgree setting. This car is definitely a miracle in engineering. I think one needs to drive one on a regular basis to really appreciate it. The tire situation not so much.

 

49 miles yesterday, mostly interstate, full charge at start, some stop and go traffic, mostly flat. Around 33 miles electric, rest as a hybrid (at 65.5 MPG for the hybrid portion). Regular driving mode (not ECO mode), and regular A/C at 74 degrees (not ECO mode A/C). Started in plain old EV mode. Boom.


How did I calculate MPG for the hybrid portion?

I was able to use the 199.99 as an actual number, as it's really close to a "true" 199.9 - I know this as it dipped to around 195 a few miles from my destination, so...

- take the 199.99 MPG and divide it by 49.1 total miles, and you've got .2467 gallons of gas used, then
- subtract the 33 electric miles from the 49.1 total miles, and you've got 16.1 miles of hybrid operation
- take the 16.1 miles of hybrid operation and divide it by the .2467 gallons of gas used, and you've got 65.5 MPG for the hybrid portion.

subtract the 33 electric miles from the 49.1 total miles, divide that by the .2467 gallons of gas used [that's 199.9 MPG/and you've got 16.1 miles of hybrid operation at 65.5 MPG)



I laugh at you, ECO score algorithm. If this is a 74, I'll be happy to be a "C student" every day!