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Gen2 fuel consumption

Asked by Bruce Loomes

I drive a 2009 Proton Gen 2 GXR 5-door automatic hatch. It has done 15,000 km and runs perfectly and is a fun car to drive, but I'm confused about the fuel consumption. According to the trip computer I get between 7.5 and 8.8 L/100 km in mostly suburban and local highway use, but when I do a manual calculation I find I am actually getting between 10.5 and 12.5 L/100 km. Proton has suggested that I take the car to a dealer for a fuel consumption test, for which they have put out a service bulletin to dealers. I cannot see how this can help with the variation between the computer read-out and actual results. Have you any idea as that may explain this variation please?

Answered by CarsGuide

12 May 2011 Graham Smith

Proton's official consumption for the Gen 2 GXR is 7.9 L/100 km average, but 6.2 L/100 km on highway and 10.8 L/100 km on urban use. The latter suggests your car is not far away from the company's claims. Normally the trip computer is more accurate because it measures the fuel being injected into the engine, whereas the old fashioned method of fill-to-fill measurement has plenty of room for error. But in your case there is reason to suspect the trip computer, even more so when you've been told there's a dealer bulletin to check for fuel consumption. That suggests there is something wrong. Take it to the dealer and have it checked as has been recommended.

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