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This whole weight thing is very much dependent on how you do your daily drive. It has a lot to do about momentum.
The bigger mass is only good if you travel on highways most of the time such as in Australia, the US and the Autobahn. The heavier load means that you're having lots of momentum and you need to pay less attention with the throttle to keep the speed in the coasting range. You would then choose bigger tyres for higher gearing and bigger rotating mass. Plus this is where aero mods come to play as your speed exceeds 100km/h or 60mph
If you travel in stop and go traffic most of the time like in most Asian cities, then that mass becomes the enemy. You need more energy to bring the beast up to normal coasting speed and then braking. Repeat this for every stop or traffic lights. In which case a light weight car will always perform better and you'd stick with 15in wheels.
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