I've got a much older 1.4tdi polo and I average 55mpg most of the time, it never falls below 52mpg no matter how I drive it. If I do motorways only this goes to 58-60mpg. Its also worth nothing that these german diesels do hold their value very well so even if you do buy one you won't lose as much as a petrol on resale. I'm VERY surprised you are getting 45mpg in a C180, almost doesn't sound right, they aren't renowned for their economy.
Oh an I forgot to add that mine's remaped, so you will see better mpg then what I've stated if you keep it unmapped. Another thing that surprised me was the ride quality of the little polo (and this was a car I bought after being in a 5 series and before that a C-class), its very very impressive for what it is. But if I was doing motorway miles all the time i'd rather crash in a Golf.
Oh an I forgot to add that mine's remaped, so you will see better mpg then what I've stated if you keep it unmapped. Another thing that surprised me was the ride quality of the little polo (and this was a car I bought after being in a 5 series and before that a C-class), its very very impressive for what it is. But if I was doing motorway miles all the time i'd rather crash in a Golf.
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