It has been a long time since fuel was sold here in the UK in gallons, but most cars still are spoken of in terms of MPG (miles driven per gallon of fuel). There are steps to move this to L per 100km - but most people here still use MPG.
We also use Pints in pubs, which are a different size to US pints.
It's worth pointing out the convenient imperial units are the ones that are hardest to get rid of. The "pints" in pubs is because a pint is about how much a drink should be, in fact I've often found drinking 500ml to be just slightly too little to drink, probably because I'm used to the pint, but "1 unit" is also just a lot easier to keep than "500 units" or "50 units".
> We also use Pints in pubs
And so we should.
A British pint is 568 ml. We will switch to smaller metric 500 ml 'half-litre' beers over my dead body.
All other imperial measurements can bugger off to the history books where they rightly belong.