Thomas, picking up his second gold of the three-day competition, added: "It was alright, wasn't it? We knew we were on good form and we wanted a track record.
"We were just floating out there, the crowd carried us around."
British Cycling's performance director, Dave Brailsford - who oversaw their haul of eight gold medals in Beijing - said he was not surprised by his squad's impressive performance.
"We always said that after Beijing we were going to back off a bit for a year and to be honest I think the rest of the world got a bit chippy and thought that's the end of it and that we were a one-trick pony team," he said.
"So we came into this World Cup wanting to put down a marker and that's what we've done."
'Mission accomplished' for Brailsford
Victoria Pendleton, world champion in the women's keirin in 2007, proved unable to repeat the achievement in front of a home crowd.
The 29-year-old, who won sprint gold on Friday, left herself too much to do on the outside in the closing stages of Sunday's keirin final, finishing fifth as Lithuania's Simona Krupeckaite took gold.
Stockton 36-year-old Chris Newton finished seventh in the men's scratch race, a lap down on Russian winner Ivan Kovalev.
Crampton rounded off the event by winning the 15,000 euros (£13,500) cash prize for the international keirin.
British cyclists have racked up 10 gold medals over the three days of the competition in Manchester.
Team Sky+HD: Ross Edgar, Chris Hoy, Peter Mitchell, Victoria Pendleton, Jamie Staff
Team GB: Lizzie Armitstead, Steven Burke, Ed Clancy, Matt Crampton, David Daniell, Wendy Houvenaghel, Rebecca James, Jason Kenny, Chris Newton, Joanna Rowsell, Ben Swift, Andy Tennant, Geraint Thomas, Jess Varnish
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