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Traditionally diesel engines are better when it comes to mpg. They tend to be more durable & get more miles before needing to be serviced or breaking down. BUT, when you do need to do a repair, the repairs are more costly. They are also louder, which some people dont like. Its also bad to start a diesel up & just drive away. The engine should idle a bit to warm up...they run better. Gas engines in newer cars though are closing the gap, and some are surpassing diesels in terms of mpg.

Diesel, well it does in the UK