If you are the least bit worried about reliability, up-time, etc, adding FI is not the way to go. If you are willing to sacrifice those things to increase your Smiles Per Gallon, I say go for it.
Installation is seldom a straight-forward affair - be prepared to spend 2 to 3 times what your original estimate is. And it's definitely not a job for the average weekend mechanic - don't forget to budget for labor. Make sure you have the resources to do the extra maintenance and fix what breaks. It helps to have a second vehicle.
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