Otto cycle is a thermodynamic description of the 4-stroke engine used by most cars and small trucks. The efficiency depends mostly on the compression ratio which is analogous to atmospheric lapse rate. This ratio is about 15 for a car, 1.25 for the Earth model and 100 for Venus.
The ratio of heat in vs. work is about 9 times greater for your car, than the Earth system given here. The Earth system is over a distance of a few kilometers, while Venus calculations extend over the whole planet. Its rotation is extremely slow (over 100 Earth days). This allows the night side atmosphere to cool down to -170 Celsius, which then sinks down and draws in hot air from the other side of the planet.
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