[Closed] Most economical petrol cars

For the past week I've been driving an old MK1 Yaris (dating from around 2001, I think). I haven't worked out the fuel consumption, but according to the inbuilt trip computer it's returning over 53mpg. This is driving gently, mainly on A-roads, and some town driving.

I don't follow current car trends, but I see that some cars have official fuel consumption figures of around 80mpg, but apparently their real life consumption is usually much lower.

So, what's the most economical petrol car you've driven, and can it sip fuel slower than an old Yaris?