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A hypothesis, unproven

The hypothesis: that the fuel economy of one of those new small petrol turbos is as comparable to that of an equivalent diesel in reality as it is on paper.

The experiment: first take two versions of the same car and compare them. I don’t have two versions of the same car but my father has had. He replaced his diesel Focus (1.5l, 99 bhp) with a petrol one (1.0 turbo triple, 125 bhp) in 2018. I never drove the diesel but due to the Current Unpleasantness I’ve been driving the petrol one for the past few weeks.

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This is what it’s averaged in my hands and on short journeys:

Illustration for article titled A hypothesis, unproven
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7.7 l/100 km is equivalent to 37.7 mpg (Imp) or 30.5 mpg (US).

As I recall the diesel did just under 6 l/100 km which equates to 47.1 mpg (Imp) or 39.2 mpg (US)

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I find the hypothesis unproven.

Yes, it was only 14 deg today. Yes, it’s supposed to be summer.

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