I am getting excellent mpg figures despite the length of time I am sitting in queuing traffic so perhaps it would be prudent to hang onto this Jazz.
If it does what you need, it's a lot easier and cheaper to hang on to them! I'm a big believer in the old adage "if it's not broke, don't mend it"... or swap it.
We only intended this Jazz as a cheap stopgap, and although it's not 100% cosmetically, it runs and drives so well I'm loathed to part with it. I think I might make an effort to tidy the body up and run it for a few years.