Ben Stokes took six for 99 on day one in Sydney, but the Durham all-rounder admits that England allowed Australia '50-60' more runs than they should have got.
England had their hosts in trouble at 97 for five, with Stokes among the early wickets, before Brad Haddin (75) and Steve Smith (115) launched a recovery.
Australia were eventually bowled out for 326 as Stokes took career-best figures and a maiden five-wicket haul in what is just his fourth Test.
"We started really well, had them 90 for five and then Haddin and Smith sort of counter-attacked that start that we got," Stokes said.
"I think they ended up getting 50 or 60 too many than we would have liked," he added.
Australia lead the series 4-0 and are attempting to claim their third 5-0 Ashes whitewash following comprehensive wins in Brisbane, Adelaide, Perth and Melbourne.
Stokes scored a maiden Test century in Perth and has emerged as one of the few bright spots for England during a dismal tour.
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