Auto Racing: TBI or MPFI, efi conversion, better mileage

Question
i want an EFI conversion.

should i go with TBI or MPFI?

how much better is MPFI than TBI?

i assume that MPFI gets much better power but only marginal mileage increases. is his true?  

Answer
Richard-

  MPFI (or SEFI) is better all around when compared to TBI.  Since it only sprays fuel when it's time for the cylinder to fire and it injects much closer to the cylinder it atomizes fuel much better and less fuel is wasted.  TBI is a lot like an electronic carb.  It sprays fuel into a carb-like intake manifold and from there it's fuel's job to get things done.  The only issue is that aftermarket MPFI conversions are quite a bit more expensive usually and factory setups are ridiculously complicated.  But hey...in the long run you'll get more power and better mileage.  Hope this helps.

Steve