Can anway tell me why in a mk1 Jazz at 70mph in top gear I can only manage 41mph when trying to be as gently as possible? That seems a bit poor to me, I should probably check tyre pressures as I haven't done in a while, what's everyone running?
One thing I will say though, my particular Jazz isn't very efficient as it has the worst tyre QwikFit had with an E rating for fuel economy, it's heavily loaded as it has quite a lot of stuff in it for work which add to the total weight and it's also got quite draggy gearbox which does have a few issues.
Also, the car is about to get to 140,000 miles in the next month or so and considering I bought it with two owners at 112,122 who had both babyied the car around the city with a few mile per year over the previous 17 years, I reckon that the engine has a fair few hours on it also so is likely suffering from wear.