I know it is wrong to make a comparison with this.
IMHO, this Campro CFE is suppose to make an additional power with relatively good FC.
But when Preve owner list down their FC, like 10-15L/100Km, it is not really good.
Almost the same FC like W211 E240, 2600cc engine, a V6 engine btw.
Then, it same FC with 525 BMW, 2.5L engien, not sure V6 or not.
When compare to 1.8 kompressor w211, even the kompressor had a better FC.
Not yet compare with turbo engine like golf GTI, or the puegeot 308 engine.
BTW, 308 engine is THP, Turbo High Pressure, make a more power, BUT, the FC is better than CFE.
NOT flaming other users, but Proton should make a CFE including with VVT both inlet n outlet and direct injection to reduce FC

there are owner getting 6.8-8l /100km. I say that is acceptable. Some getting as high as 15l/100km. I see other 1.6na engine also have high fc than CFE.