I have to use both - metric that I'm used to, and English that people around understand. It all depends on what I'm measuring - when on car, miles and gallons are Ok for me (I started driving only when moved to US), but when hiking it's km and liters.
The worst is the UK. They use both systems in some places, and sometimes it's tough to tell when the signs are in miles and when the signs are in km per hour.
Here in Virginia, and probably most if not all of the U.S uses English the most. All the speed limit signs are in mph. There is no mix. Even though the car speedometers include metric units, they are not used.
I find it annoying though. When I go overseas (my family is from Asia), all the signs are in metric units. I used to ask my relatives...why the hell is the speed limit 120 mph lol. Then they were like, its 120 km/hr
Too bad the whole world couldn't just stick to one unit
I only use imperial measurements when I'm talking about small lengths or distances like my height... probably because my parents and grandparents influenced me, since they grew up with the old imperial measurements... otherwise all Australian measurements are metric... METRIC RULES!!!
Metric rules indeed In college, we learn Chem and Phys using metric system and nobody seems to get a problem with this. Even California Department of Transportation (DOT) became metric a while ago! Sadly, some of the states DOTs are converting back to Imperial system. I guess if the K-12 system started teaching only in metric system, it would be much easier and painless to convert the whole country at once.