Well they're in par with fuel consumption of supercars. For example, a Lamborghini Aventador has 10 MPG, an Aston Martin V12 Vantage has 12 MPG, a Bentley Continental has 13, a Ferrari 488 GTB has 15,a McLaren 570GT has 16, a Mercedes AMG GT also has 16 as does a Nissan GT-R, and only Porsches get a tad above 20. Considering that none of the above could hold a candle to an F1 car, its fuel consumption doesn't sound too exotic.