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Lewis Hamilton sounded disappointed when journalists asked him in Montreal about Mercedes' engine situation.
Despite scheduling an upgrade for Montreal, the German marque has delayed it for a fortnight for quality reasons.
"The guys worked hard and gave everything, but in the end we had to take a sensible decision," world champion Lewis Hamilton said.
'The effects are greater'
But he admitted the decision could cost him in Canada.
"It's now the seventh race with the same engine. With every mile you lose more and more power. And on a track like Montreal, the effects are even greater.," said Hamilton.
Calls for F1 engine equalisation - 'I'm a big fan of Mercedes but they win too much' - Ecclestone
Not just that, his arch-rival Sebastian Vettel will benefit from a fresh and upgraded Ferrari power unit.
"If Ferrari has a fresh engine that has even more power, then that's one or two tenths and it becomes a difficult task to keep up with them.
As a driver, of course I'll try everything," said Hamilton.
Vettel, meanwhile, played down any advantage he might have.
"I don't know what Mercedes has or what they gain or lose because of it. But I'm sure that all teams eventually bring new parts.
The important thing is not what we do here, but whether over the course of the season we develop the car better than the others," he said.