It amazes me how thick some people are.
next time you fill up, read the pump and see how many litres, not dollars you put in. when you've paid get back in your car and press the trip button before you start it.
next time you fill up.. read the trip, then see how many litres it took you.
eg., i always fill up at around the 300km mark, and always put in about 33L, unless I had a track day, then i might do 150 and put in 30L
So we can see it takes me about 11L to do a 100 km of normal driving.. thats what you should be comparing. If I told you i had 300 to a tank before i fill up, that would be useless. If i told you i would probably get 500 a tank, that would be guessing.. which is also useless