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Index/Topics/Fuel Economy

Fuel Economy

The relationship between engine modifications and fuel economy, including the impact of drive behavior and tuning.

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Jan 26, 2026
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How much did a 1981 VW Diesel Rabbit weigh, and what was its horsepower

The Rabbit diesel in spec was fitted with a 1.6‑liter naturally aspirated diesel that Volkswagen rated at 52 horsepower; earlier 1.5‑liter diesel variants were rated at about 48 horsepower (and the co...

Jan 31, 2026

in a vintage American sedan with a V8 engine, how much highway mileage might be lost when switching from a mild factory camshaft to an aggressive street performance camshaft

Most real-world reports from owners and tech forums show that swapping a mild factory cam for an aggressive street performance cam on a usually costs little to moderate highway economy in routine crui...