The EA113 engine in the Mk5 GTi was pretty heavy, but you could get around 8l/100km on the open road and 11l/100km in town if you were careful with the noise pedal.
Common failures of this engine was the HPFP cam follower which needed frequent replacement, the coolant flange would leak and failed valve covers were also pretty common. Carbon buildup was also an issue.
They are all easy fixes though.
You forget VW locks all tend to go too.
I had a Golf 4 long ago, happiest day I got rid of it. Golf 5 is equally heavy on fuel.
Rather get a Polo 1.4 with all the extras. My friend did exactly that. Cost her new R230k, but low on fuel, low on maintenance, leather seats, sunroof, the works.
Or you could go for something like this (maybe not the colour leather inside). But its heckuva low on fuel...
2016 Volkswagen (VW) Polo GP 1.4 TDi Trendline - White with 94000km for sale in Gauteng - Johannesburg South Africa | Carfind.co.za
www.carfind.co.za
I know of many people with the older Polo TDI (even the round light ones)
But these are the lowest on fuel you can get... Costly though.
New and Used Volkswagen (VW) Polo Cars for sale in South Africa. Top dealerships country-wide.
www.carfind.co.za
3.1 litre in the countryside compared to 8l for the Golf GTI. Its a no brainer.
But if you want style and luxury, rather the Volvo V40 Diesel. Its 4.3l per 100kms.