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Turbines are not fuel efficient for vehicles that are stationary as they idle at 20k rpm. Also the exhaust is highly polluting.

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Well, maybe not if you try to directly couple them to the tires. You might have better luck if you try powering a generator to charge batteries. What do you mean by "highly polluting"? Highly polluting compared to what?

They run extremely lean, consequently they produce nitrogen oxides like you wouldn't believe.

If you'd quote a source I might believe.

Probably not 100% convincing, but http://en.wikipedia.org/wiki/Chrysler_Turbine_Car:

"Nevertheless, the turbine generated nitrogen oxides and the challenge of limiting them proved an ongoing problem throughout development."

If the amount produced were low, I doubt it "proved an ongoing problem"

Also: https://wpweb2.tepper.cmu.edu/rlang/RenewElec/CEIC_White_Pap...:

"Gas turbines operate best at full-power steady state conditions where they are at their highest fuel and emissions efficiencies. Deviations away from this tuned set point result in significant inefficiencies (particularly with NOx emissions)"

Mechanical to Electrical back to Mechanical is not efficient unless you can turn off the mechanical at idle.. thats not possible with a turbine...

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