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The 1.5 was a timing belt engine SOHC. The 1.6 was DOHC chain driven cams. I doubt you will see enough mileage improvement to ever justify that swap, even if it is possible.
Nissan also made a diesel version of that Sentra that was a mileage champion.
I drove a 4dr 240 miles (pre E10 here) on the Interstate on 6 gallons of fuel, going the speed limit or slightly over. The 1.6 is a great engine with few flaws. As long as you have decent gearing it should be good for great mileage, driven properly.
regards
Mech
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