## Gasoline Consumption of Our 2004 *Hybrid* Toyota Prius

(MPG and liters/100 km)

"JELLY BEAN"

Prius is the "Volkswagen" of the 21st Century!

Anything different in automotive mass production today is old technology.

My wife, Diana, took delivery of her new 2004 *Hybrid* Toyota Prius in February 2004.

We have been monitoring our Prius's fuel-consumption rate ever since. We calculate the miles-per-U.S. gallon (MPG) ratio after each fill-up.

**The first graph below shows the MPG ratios plotted against total miles driven.**

**The second graph below shows the MPG ratios plotted against total miles driven calculated from the last ten fill-ups.**

We also calculate the cumulative average of the MPG ratios from all fill-ups.

**The third graph below shows the cumulative average MPG ratio plotted against total miles driven.**

**The fourth graph below shows, in European terms, the cumulative average liter/100 km ratio plotted against total kilometers driven.**

**The fifth graph below shows the total miles driven plotted against total gallons consumed. The data is fitted with a "least-squares" straight line. The slope of the line (coefficient of V) is the car's lifetime MPG ratio.**

The low starting MPG value in the first graph originates from the car's tank not being full of gasoline when we took delivery of our Prius.

Note that 50 MPG equals 4.70 liters/100 km, 51 MPG equals 4.61 liters/100 km, and 52 MPG equals 4.52 liters/100 km.

The driving, mostly in Southern California, has included both normal and challenging conditions, such as, in city, on freeways, over mountains (up to 8,443 ft, or 2573 m) with and without snow chains, including a long distance on a very hot day (108 deg F, or 42 deg C), and steep mountain driving on a hot day.

For a Prius tinkerer's and driver's viewpoint, see Attila Vass' Web site.

Updated Aug. 1, 2012

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