Statement — “Esteem” is among the most fuel-efficient cars in its segment: with a light foot it delivers ~12.5 km/l in city without A/C and about ~11 km/l with A/C on.\n\nConclusions —\nI. The car’s A/C is powered by the same fuel that powers the engine.\nII. With A/C on, “Fiat” ensures only 10 km/l.

Introduction / Context:
The statement compares mileage of the same car with A/C off vs on, showing a reduction. We test two conclusions: fuel source for A/C (I) and a claim about another brand’s mileage (II).

Given Data / Assumptions:

• Same vehicle’s km/l drop with A/C → added load on the engine → same fuel energy pool is used.
• No information at all about any “Fiat” model or its mileage.

Concept / Approach:
I follows: the decreased fuel economy with A/C indicates the compressor load is ultimately taken from engine output, which is powered by the same fuel. II does not follow: the premise mentions nothing about “Fiat” or “10 km/l.”

Final Answer:
Only conclusion I follows.