New member, been tracking the fuel consumption of my 2007 Pontiac G6 GT since May of this year.
Over the past few months I was averaging 11.2L/100 km (21 MPG), but for some reason my last tank returned 9.0L/100 km (26MPG). Other than one brief 10km (6 mile) highway trip on this tank, the rest of the driving was identical to all of the previous fill-ups before it. I'm confused why the sudden 20% increase in fuel economy?
This one has left me stumped, see data below. Any ideas?
The difference checks out I believe. I was confused why my fuel economy suddenly improved by 20%, but after discovering I only received 80% of a full tank it makes sense. The number of litres to refill the tank, divided by the number of km driven since the last fill-up, provides the fuel consumption rate of L/km. However because my tank was not completely filled, it appears I drove all of those KM on less fuel.
in my own excel sheets for the cars, the FE tables include a column to average with the next and previous tanks. It shows they tend to even out.
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
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