2001 V70 - I did the tests, you can too. I discovered that using
Premium vs. Regular gave me about a 12% boost in fuel economy. A little
arithmetic will show you the break-even point in fuel price beyond which
you can justify the additional expense.
But then, I have my headlamps on all the time. Besides making me look
stupid, that reduces MPG by an additional .002... (Yes, I tested that
too)
