Temperature is an interesting one. I've no recorded figures to back this up but it
seems like the Mk3 is more sensitive to temperature (or at least environmental) changes than previous models. From what I recall my previous two Jazz (Mk1, Mk2) varied by only a couple of MPG. I think the Mk2 was ~51mpg in summer, and ~49mpg in winter. My Mk3 is ~56mpg in summer and ~50mpg in winter.
[/quote]
Seven years ago I posted these figures. I must have a look at how the Mk 3 compares.
"Taking winter as October to March inclusive, and based on total fuel bought and total mileage over 3+ years, I find the winter average for a 1.4 ES manual is 46.8 mpg over 14777 miles, with the summer giving 49.3 mpg over 14481 miles. Overall average 48.0 mpg"