There is no one size fits all solution for spark plugs. Usually, best economy is found by using properly gapped stock plugs or the platinum version of stock plugs.
The spark plug is a "medium" for which to introduce the spark inside the combustion chamber. The sparkplug does not create electricity, this is being done by the ignition coil.
So NO, those Jetniter plugs don't "save" on fuel as what is being claimed. For the engine to perform at optimum levels, manufacturer specified and propely gapped sparkplugs should be used.