Interesting one. Coolant loss was the reason I got shut of my previous car. What I did notice what that I could actually go quite some distance if I was careful, but commuting crucified the loss.
The actual cause of the loss was either a head gasket or a liner.
What I put the difference down to was when going a distaance, the engine would spend most of its time on a light load, with minimal turbo input. When commuting, there was a lot more stop/start and more boost from the turbo.
Not that that helps you much!
Paul
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