I am also a mechanic, and most of that is plain wrong, older cars can, and will have fuel line problems if not changed, also, when first switching over, it is recommended to change fuel filter a couple of times because some crap will be dissolved /dislodged. you are not looking for economy with E85, you use about 30% more (but because it is subsidised cheaper, running costs are about the same on standard cars tuned for it), combustion temps are decreased, and it is perfectly safe for cats. commodores sold after this month are E85 ready, and over 100 Caltex servos will be selling E85 by the end of the year. I am rebuilding my motor at the end of the year, and it will built and tuned for E85, looking for 270RWKW out of a streetable NA 3 litre, can't do that on 98...