An interesting topic, to be sure, but I bet most of us drive our Cobras less than 5000miles a year. At 10mpg's that's 500 gallons. Even if it cost $4.00 a gallon for premium that's $2000 a year max for fuel. If I change everything I can about my BB Ford's economy performance and drive it like a grandmother I'd save at most half of that..probably less....up to $1000 a year (max).
So...... let's see....our Cobras are luxuries (toys) on which we spend $50-150K to build and improve.... Why then would I give up the very essence of raw unmitigated power, brute delight, thrilling driving experience and beautiful sound that my car offers in order to save a few hundred dollars a year??? That's about the equivalent of a few days' hotels on a summer trip with the wiffie.
My wife's Escalade gets 10mpg except on long trips....now THAT's an ouch!
Regards,
Dirk