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- 04 Aug 2015, 19:01
- Forum: S60, V70, V70-XC 2001-07
- Topic: improving highway mpg S60 R 05 5 sp auto
- Replies: 13
- Views: 6722
Re: improving highway mpg S60 R 05 5 sp auto
Won't switching from Premium to regular unleaded mess up your coils and plugs by fire too soon from the lower compression needed to combust the molecules?