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Howdy, neighbor. The XFI was only built in Canada, not sold here. As well as the cam, it has a leaner mixture from the computer, 2-ring pistons and other tweaks. There are four different final drive ratios available on drop-in trannys. Only the mounting hardware and shafts are different on the 4-cyl. The XFI and the 8-valve had the tallest gears, but possibly too tall for the later body. There are several good sites dedicated to metro rebuilding. For economy, porting only matters on the exhaust side. A slick intake just means you close the throttle more, except for max HP moments. You want to avoid maximum throttle opening, because it richens the mixture.
Using the starter gives a shot of rich mix, negating any benefit from switching off for much less than a minute. Bump-starting is OK. You might want to add a small electric device for crawling traffic. To get more cabin heat, you might use an exhaust heat exchanger, or just pre-warm the car with something more efficient. A block heater is good for economy and quicker warm-ups.
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