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Dan:
What sort of mileage did you get on regular and on premium?
I have noticed that as gas prices go up, the differenial between regular and premium remains about the same. About 20 cents a gallon or about 7%.
If I got 7% better mileage, say 19 to 20.5 mpg or so it would be a wash.
Since I only have cold at 20F today I do not have extreme cold, and no cold start problems, that is not an issue.
I use premium while towing my trailer, only 1000 pounds but tall with wind resistance, I get 17 to 19 MPG. Always 300+ mile trips, some 3000 miles. Usually only in the better weather.
BTW, my S60 2.4T with IPD ECU upgrade, consistently gets better mileage in the same conditions as the S90.
-- S' V'
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