The unbeaten Australians are all but assured of a spot in the February 21 final in Auckland after downing England by five wickets in Hobart and beating New Zealand in the series opener ahead of Saturday's match. His 43 was the only innings of note and at 49 balls ranked as the slowest of his 20 knocks of 25-plus in the format.
"It was another poor performance from us, we didn't quite soak up the pressure early on with the bat and then we never really kicked on", Buttler said. "I never got going and we were never able to get to a defendable score".
The visitors were struggling at 70 for 4 before the 43-run stand between Jos Buttler (46) and Sam Billings (29) got the total some respectability.
England, minus injured skipper Eoin Morgan, were reeling at 34 for three in the fourth over when David Warner ran out Dawid Malan with a brilliant direct hit.
To that end, a pair of boundaries from Billings to begin the 18th over was a good start but he was caught off Billy Stanlake (2-28) from the next ball and when Kane Richardson (3-33) had Buttler caught on the rope from the last ball of the innings, England were 137-7.
The hosts ended on 138-3 after Australia captain David Warner won the toss and elected to field.
Glenn Maxwell, who scored a stunning century in the five-wicket triumph last time out, top scored again for his side with 39 as the hosts chased down England's 137-7 easily.
It fell to D'Arcy Short (35) Chris Lynn (31) and Glenn Maxwell (39) to make some more respectable run totals and spur the Aussies on the road to victory.
A reverse sweep off the second ball of the 10th over, bowled by Rashid, took Maxwell to 1,000 T20i runs. He was sent packing by Chris Jordan in the final over of the powerplay.
Jos Buttler is hoping for one more crack at toppling Australia's Twenty20 specialists but knows England will have to improve considerably to reach the final of the Trans-Tasman tri-series.
That is despite Australia fielding a side shorn, Warner aside, of all its Test stars ahead of the forthcoming series in South Africa.