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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,977
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As usual, something most people do not think out fully.
If the car has a cat on its exhaust and I believe the 928 does, then the 100LL will clog the cat and stop the engine from running in short order. Also if there is any sort of state smog testing the car will fail badly if its able to drive to the inspection station or is stopped in a road test.
Otherwise it works great in older cars with no cat in the exhaust.. Have also heard that Jet A works great in diesels but would not know myself! 
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2021 Subaru Legacy, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB
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