Can't assume that way because each pump will have a different cut off level. Also, the light comes on earlier if you are on a slanted road or had just given it a fang. Plus, you can't estimate the number of kms left in the tank after the light has come on because it varies with the varying fuel consumption rates that you are getting with different brands of fuel.
I've tested all 4 using the L/100km method over my first 3 years of ownership and they all come up to be very similar in L/100km without any assumptions/guessing.
Originally Posted by aaronng
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