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Work more efficiently by changing Excel's chart defaults

I do a lot of x-y scatter charts (Time on the X-axis) non smoothed lines for the data sets. The 2.25 pt default line widths are problematic. I have to manually change the width of each line. So I created a chart with 6 data sets. Set each line thickness to 1 pt. Saved it as a default chart as you described. Then selected 8 columns as well as the time column created the "default" chart and 6 of the lines were 1pt but the two additional data sates reverted back to the 2.25pt line thickness. So I really didn't change the "default" line thickness. Try it!