Think you're wrong about your thoughts on " super vacs "...................the new vac's have been around for at least a year possibly two and were fitted to the extremely powerful Savage Electric T/M'S with exceptional results.
Why would suppliers fit these in place of a very old design if they were not superior ?
Another more powerful vac' motor has replaced the original in the Craftex machines and is apparently rear enough as powerfull as the previous twins.
Evolution happens and to assume that electric power can never equal that developed by an internal combustion engine is blinkered to say the least.
If you want an idea of what electric power can do look for the performance spec's on the latest electric supercars which I believe can leave any modern " supercar " standing.
Im all for electric

' Super vacs ' is reference to what some folk here called the 6.6 after reading the
misleading data .
the savage and nordic1 truckmounts both used twin 7.2 vacs , hardly huge performance ... but when it was put to him on a US forum he questioned the need to have more performance to simply extract ... and he may well have a point ...
the switch to 6.6 is partly because they perform well ( im not saying they dont )
and because they draw less amps than the 7.2 used ... low amp draw is desirable in the US because they draw twice as many amps per watt at 120v as we do at 230 ...
When the misleading data was first posted on the cross american site ... people logically thought the twin 6.6 had high lift and cfm ... the best of both worlds ..almost truckmount like figures ...
so main rivals Mytee posted a video on you-tube with its test results for twin 6.6 vs 5.7 .... cross american has not responded ... check it out ...