I did not switch to Synthetic for add'l mpg or add'l performance - I switched for longevity of the at and peace of mind.
However, I have gotten both as a bonus !
I drive the heck outta my 850 turbo in Houston traffic and freeways.
No change in driving or routes and have improved the mpg by 1.5 to 2mpg average.
Another added bonus, shifts are crisper and downshift much more responsive.
BTW - dave old boy, it is wise not to express an opinion on matters unless you have some clue as to what you are speaking , eh?
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