The ZT isn't much, if any, wider inside so unless you are considering a ZT-T I wouldn't think there would be much advantage.
Fuel wise a heavier car using the same engine will use more fuel, a larger engine will use more fuel on the urban cycle but should be better on motorways as it will need less throttle to maintain the same speed.
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Former custodian of the legend that was FE54 - RIP
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