I had one of Mr Hertz’ Fiestas for a month.

This is what the trip computer said when I handed it back.

Illustration for article titled Lies and their telling
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Fuel consumption averaged 5.8 l/100 km or 48.7 mpg (Imp) or 40.5 mpg (US). Reasonably good bearing in mind this included many short journeys.

But is it true? These devices notoriously tell fibs.

I got the car full, handed it back full and bought 61.2 l. I drove 982 km so a bit of arithmetic tells me I actually did 6.2 l/100 km (45.6 mpg Imp or 37.9 mpg US). Quite the difference then. So, trip computer speak with forked tongue. Who’d have thought?

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In case you’re wondering, those 61.2 litres cost me €80. No cheap fuel here despite the price of crude falling dramatically.

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