Over the past few days I have been looking through the features and decoded options for my LT1 Firebird and L98 Corvette. While sifting through the L98 tune (7277 ecu) I found it has a highway mode. Set it and sure enough the car runs leaner as advertised. Now I looked for a way to replicate it in my LT1 ecu but its nowhere is sight and if you leave closed loop enabled, its locked to the stoich afr constant. Has anyone seen a way to run a table for closed loop afr similar to the older highway mode? I'm not sure if this is how it works but would it be possible to take the 4 points of the stoich afr table and make them seek out a value from another table? You could set the table to reference map vs rpm like a VE table.