Does my car use more fuel at 20mph than 30mph, making low speed limits worse for the environment?

I live in North London, where roads now have a 20mph limit - and I'm convinced that I'm filling up with fuel more often.
ESPN

2026 NBA mock draft machine: Simulate 60 picks over two rounds

Want to be the general manager of an NBA franchise? You're in luck! ESPN Analytics has released its new NBA draft simulator ahead of the 2026 NBA draft, allowing you to act as the key decision-maker ...