Real world fuel consumption calculation

July 13, 2019

According to Google Earth it’s 40.2 km from our home to the parking lot of Rosebridge Manor where my mother is a resident.  For most of the route there is little traffic, though there are a number of small, restricted-speed hamlets and stop signs.

Tonight with the 2014 Lexus es300h I got 5.2 L/100 km on the drive.  That’s 4.1808 litres of regular fuel for the round trip, or $5.35 at the current price at the service station in Toledo of $1.279 per litre.

Fuel consumption rates vary from 5.1 to 5.4 for the trip.  This is with air conditioning and headlights off, seat cooler on, windows and sunroof open, fine weather on a summer evening, 80 to 85 km/hr, and using electric power while passing through the hamlets.

On the same route under the same conditions, my 2004 Porsche Cayenne S had a fuel consumption rate of 10.1 L/100 km on premium fuel.  The last time I filled this car the rate was $1.399 but that was a couple of months ago.

Marshall challenged me to repeat this test with the Lexus es300h “while driving it like a Porsche.”  I obliged on a 33C afternoon, glorying in the air conditioning, even leaving the car for fifteen minutes with the air conditioner (though not the engine) running.  I set the cruise control for 100 km/hr instead of 80 and passed on the two-lane roads whenever the opportunity arose.  Fuel consumption was 6.4 L/100 km.

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