welcome to the forum...
can highly recommend a polo gti. we have had ours for nearly 2 years. had no issues with it reliability wise...
servicing costs vary depending upon where you go/ where you live etc..
had our 15k service done for $225 and 30k service for just over $300 from memory... not at a dealer but a volkswagen/Audi specialist that i have been going to for years.
our running costs are similar to above ^^^^
approx 7-7.5L/100k's on average .. more if you like to plant the foot.
1974 1300 Beetle, 1997 Golf GL, 2003 New Beetle Cabrio, 2014 Audi A4 quattro
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