Views on hot weather affecting fuel cost

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ema1, Feb 16, 9:16am
Particularly noticeable with turbo diesels.
The colder the air the more expansion you get in combustion, hot air is already to a fair degree expanded before it reaches the combustion chambers.
Winter driving =more power in some engines.

rsr72, Apr 29, 5:56pm
The cooler the fuel the more dense, as any race team has long known.
The warmer it is the more it expands.