how much power do I needed?

[WillyC]

I'm undecided about which to buy - the old fashoned carburetor motors or the newer EFI. I'm definately going to buy one of the two due to much less $$$ opposed to a HPDI or 4stroke. I've heard that the EFI is not much more fuel efficient and a whole lot more expensive to work on. Can anybody chime in on the efficiency differences between a carburetor motor and an EFI on a 150 or 200.