improving highway mpg S60 R 05 5 sp auto

[heyitsmebobbyd]

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?

[abscate]

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?

No.

[oragex]

Nothing you can do, unless driving slower. Higher altitude means less O2 means the engine will have less power no matter what.

[abscate]

Dropping from 70 to 60 is huge in my T5

Drafting saves you gas money but it is offset by a big body shop repair shop eventually