Hello Vic..
Not sure what you mean as the FlexFuel “mark”..the Buick Regal does NOT have the Flex Fuel Badge and you said modified as a premium” vehicle..again not sure of your terminology .
The Regals and LaCrosses as well as Cadillac (premium vehicles as you put it) have always had the Flex Fuel Badges
Lexus does not have a FFV
