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Based on the Audi R12 I think a diesel based sports car is in the immediate future. We drive cars designed in Europe where diesel is not an ugly word. Europe will continue to move towards very efficient (hp/torque/emmisions) diesel engines. In America and other parts of the world where grain is plentiful (plenty of land to support the production) ethanol will be pushed. Just my opionion I could be wrong.
As far as retrofitting an older Porsche for ethanol use, how many threads have we seen recently that dealt with replacing fuel lines? Absolutely the early adopters will pay the premium for the rest of us, but once parts are identified as working solutions the price will drop. Technology will also evolve, possibly from Porsche themselves (but unlikely) and ethanol resistent seals for our older cars will become available. Wayne, how would you like to be the first supplier of seals for older European cars that will allow them to run ethanol? How much will that be worth to the millions of old car nuts?
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Grady aka plain fan
66 912 - enjoying the good life
78 911 SC and 90 C2 turbo look cab - gone but not forgotten
01 996 TT - 
09 Audi A4 Avant - daily driver
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