I will travel to Croatia in my jazz 1.4 gd next weekend, that is about 1500 km from belgium, so I will be able to answer your question as soon as I get there . I Really wonder how it will handle long climbs on autobahn in germany with 83 hp.
Greetings from belgium
i've forgot that i have promissed to share my experience from the long distance trip and that i will correct now:
1. i find it very comfortable and i have felt no backache after driving almost 20 hours with few stops
2. i maintained 115/120kph (3500 rpm) because i have experienced that it gets much noisier when driving above this speed
3. my biggest worry were the long steep hills in germany, but when you know that you are driving 1400 cc engine with 83 hp you cant expect miracles. engine gets us up the hill at max of 100kph and downhill i take the foot of the pedal and let it roll down the hill at speed of 120 kph (this has very positive influence on the mpg which i didn't knew before but i don't know if it has negative influnce on the engine and gearbox).
4. when using airconditioning the power loss is very noticeable but as i already said you have to realise what kind of car you are driving.
5. no problems at all
6. my wife and child found it comfortable enough on the back seat
7. average consumption over the whole trip of almost 4000 km was 5.5 l/100 km or 51 mpg (with two grownups, a child and 3 large pieces of luggage on board)
i hope this helps
my appologies for my written english, since i'm no native speaker