An MPGE/MPGGE (Miles Per Gallon Gasoline Equivalent) standard must be defined and adopted which integrates the electric fuel consumption of PHEV's. The current "MPG" claims of various organizations needs to be addressed and should be stated as accurate MPGGE figures. Simply put the term MPG can only be used if the sole fuel source is gasoline. A pure electric vehicles native fuel economy is stated as miles per kWh or kWh per miles, but these figure can be converted into an equivalent MPG or MPGE/MPGGE value more familiar to the general public. A PHEV capable of being fueled with either gasoline or electricity, either in combination or exclusively on one fuel, must state it's economy rating in terms that describe all fuels consumed per unit distance.
The only honest method for stating a PHEV's fuel economy is as one of the following:
- x MPG + x kWh/mile for a given range per battery charge.
- x MPG + x kWh per a trip or tank of a given distance.
- x MPGGE (combination of gas and electric energy consumed per a given distance)
- x to x MPGGE ( Stated as a range from pure gassoline to pure electric fuel economy )
List of misleading MPG claims
CalCars themselves uses a bumper sticker stating "100+ MPG". It would be more accurate for them ( Myself included) to state:
- This PHEV gets 50 to 150 MPGGE
- This PHEV gets 50 MPG on gas or 150 MPGGE for 10 miles with no gas.
"to convert a 40+ mpg Prius into a 100+ mpg Prius Plus (plus 1 cent/mile of electricity). With the conversion system installed, a Prius can be driven for the first 10-15 miles on electricity before reverting to standard Prius driving mode."
"the first 40 or so miles with a gasoline efficiency of over 100mpg" "In low speed city driving and 55mph freeway driving it is possible to average over 200mpg"
"100+ mpg for 30-40 miles."
"100+ MPG" "150 MPG"
"100 to 150mpg in combined cycle driving"
Plug-in Conversions Corporation
"For example, driving 100 miles after charging up a PHEV-24 system will increase your mileage by 30%, to 65 mpg instead of non-PHEV mileage of about 50 mpg."
"truck getting about 16 MPG to a PHEV getting up to 41 MPG."
Efficient Drivetrains Inc
"Average drivers can easily attain well over 100 miles per gallon today"
"150 mpg" "250 mpg sedan"
"artfully calculated 150 mpge number" Somewhere they actually stated "150 mpge" without including electric consumption.
- “Gasoline mileage is calculated by using average American driving patterns estimated by the U.S. Department of Transportation and simulating the EPA combined urban/highway driving cycle of the host vehicle operating only with its conventional hybrid drive train. In 2003, the U.S. Department of Transportation reported that 78% of Americans drive less than 40 miles a day. On those days, drivers of Extreme Hybrids will need no gasoline at all -- even driving an SUV,” Furia said.
- “Say someone drives 40 miles a day 6 days a week and 100 miles the seventh. That’s 340 miles a week. The first 280 are electric. The next 60 miles use gas. That’s 340 miles on a little more than two gallons of gasoline for the week, assuming 32/29 urban/highway mileage in the host unmodified hybrid SUV. Although this translates into 170 MPG, we use a more conservative 150 MPG to take into account that mileage will vary depending on where and how a car is driven, but we are comfortable that 150 miles per gallon of gasoline is a good number.”