transmission and cam are the two big items to get better mileage.
The others are smaller gains and probably can be made up for with other mods that are easier. The computers are almost identical and there is almost no gain to be had from swapping them. It really is not worth crawling under the dash to swap them even if you had one. The other difference is the xfi has 1 compression ring instead of two so the only way to duplicate that is to tear the engine down and rebuild it but use only the top compression ring. That is a huge amount of work for maybe 1mpg
Best bet is to get the xfi cam either at a junkyard or send in a stock one to get reground. Set the cam advance to whatever matches your driving style, usually a few degrees advanced by drilling a new indexing hole in the sprocket. And finding a better geared transmission. Here are the available ratios and what they came out of:
Quote:
The available transmission ratios and what they are out of:
* 3.52:1 1.3L SOHC Swift up to mid year ‘95
* 3.79:1 98-01 4 cylinder Metro
* 3.85:1 XFi Metro
* 3.95:1 mid year ‘95 up 1.3L SOHC Swift
* 4.10:1 Swift GT, GTi, 95 and earlier Metro
* 4.39:1 Metro Convertible, 96+ Metro
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Find a 3.85 or better and go with 13 inch or 14 inch tires and you will drop the rpms by about 600 at 60mph.
So with the xfi cam and 3.52 gears and taller tires you should be able to beat the xfi mileage.