1st cold start of the season

[84300DT]

well it got down to about 19 deg f here last night and with the wind chill about 12-13 deg f. brrrrrh!
anyhow did not use the block heater - took 3 preglow's and short cranks sequences and she lit up
took it slowly up to operating temp but to get to 'real' operating temp took about 20 miles on the highway 70-80mph.

question is, do repeated prelglow-cranks harm the car in any way? otherwise it usually starts first crack in the cold (below freezing temps) if the block heater is plugged in for a couple of hours and then warms up very quickly.

any thoughts anyone before tucking into the turkey and stuffing!