1. a 14.5 to one ratio is leaner because the larger number is for air.
2. a 30% effecient engine only makes 30% worth of mechanical energy from 100% of the energy in the fuel. that does not mean that 70% of the fuel is unburned. i would guess that that number is way less than 5%.

sorry to hear about your broken back.

my $.02

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.