Now this is strange

I have 2 500"s ,, the black one is pushing 340 /350 on 4 greens

,,,,,,,,,,,,,,,,,,,,,,,,The white one is pushing 430 /440 on greys

I took them both to brunters for the photo shoot and used 3 quaters of a tank in the white one and over a tank in the black one

How does that work then ,, the bigger HP car on bigger injectors uses less fuel and we sat together on the motorway

They both have the same ECU , neither on close loop etc