I have run a POLO 2003 1.2 petrol for 14 years from new. It has always given me trouble. Fuel economy was around 37mpg. Its is still working and has around 120,000 miles on the clock. Thinking about replacing it with HONDA CIVIC SE I-CDTi 2.2 DIESEL 2009 model. Around 110,000 miles on the clock. Not sure if it will be a good idea. Please give some suggestions.