Economists say they found some encouraging signs in the latest inflation numbers but some warn the Bank of Canada might need a bit more convincing to cut its key interest rate next month.The annual rate of inflation fell to 1.7% in July, Statistics Canada said Tuesday (Aug. 19), down from 1.9% in June. The reading was a tenth of a percentage point below most economists’ expectations.A 16.1% decline year-over-year in gas prices tied mainly to the removal of the consumer carbon price earlier