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I agree that a "Car started" would be a considerably different need than "curfew." Curfews might be major alerts that someone is driving away with your car in the middle of the night--be it your teen or a thief!
A simple (always active) "Car started" could be something simple like log it in a Google Sheet--or a notification to a loved one that you are on the way home from work.
Or, when combined with IFTTT Pro's new filtering, probably a lot more capabilities...where perhaps you could write logic like: If I've started the car...and it's either not a work day or I have plenty of time to get to work...and fuel level < 50%...and gas prices are near the lowest price of the week...and it's above 40 degrees (I hate pumping gas when it's cold out)...then tell me "It's a good time to get gas!"
Actually, given that IFTTT Pro has this filtering, you could just set the filtering within IFTTT like this javascript. (To add this filter--which doesn't send notifications between 9am and 5pm--you have to first set up the IF and the THEN...and then go back and press the + to add the filter in javascript. Note: This particular case is as of yet untested.)
let currentHour = Meta.currentUserTime.hour();
if (currentHour >= 9 || currentHour < 17) {
IfNotifications.sendNotification.skip();
}