Many performance modifications increase efficiency, which means increased MPG ... IF one doesn't have fun with the extra HP. As long as you are increasing efficiency and not just cramming more air/fuel into the engine (eg, super-charger), performance mods can increase MPG. But few people are going to make mods and not have some fun with them.
Most modern engines are not going to see big increases in efficiency/MPG with simple mods. The auto engineers are already doing a great job in order to meet smog and mileage regulations.
Why buy a Z if you are worried about MPG?
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