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I always try to get Aral Ultimate 102 (US 96 Octane). Has served me well in the past, no issues and most engines will produce a bit more power (especially with a tune). With an Aral membership it also costs the same as normal 98 fuel (Super Plus in Germany, US 93 Octane). For my Diesel only Shell offers a performance fuel, but in contrast to Ultimate 102 I haven't noticed a difference so I just get standard Diesel.
The members across the pond unfortuantely don't have the luxury of high performance fuel.
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