accel
Well-Known Member
There's a thread here at the forum with consumer reports article discussion testing cars on regular vs premium including s550. HP difference is literally very minimal.The car will run fine on 87, Ford did a good job with the knock detection and timing tables in that regard. You WILL lose power especially under back to back runs, hot days, etc. And unfortunately the stock knock detection routine on these cars will pull a LOT of timing and keep it held back for a long time, so I don't know how anyone claims that the car makes the same power on 87 unless they don't ever accelerate, or only use it in the winter or whatever.
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