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Poor fuel economy

tobywood13
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04 Nov 2025 13:22 #262596 by tobywood13

Poor fuel economy was created by tobywood13

Hi all, my new Jimny (2000 1.3 petrol) seems to be doing quite badly on fuel economy. It barely scraped through the MoT on emissions, with the engine needing to be held at high revs to pass. We discovered that the downstream O2 sensor was not in the exhaust, just a bung. We have now refitted the downstream O2 sensor, but there hasn't really been any improvement.

The car is mainly used for short trips on country roads, but we have also tested the MPG on longer motorway runs. I will list some of the recent UK MPG figures below, calculated brim-to-brim.

29.5
30.9
28.1 (first with refitted O2 sensor)
30.2
28.5

The last two were after motorway runs, so should be better than the others.

What are some common causes of poor MPG? Are there any sensors that can be replaced to improve this? There aren't any warning lights showing, but my first thought would be to replace both O2 sensors (and the cat, as the thread is ruined). The brakes don't seem to be dragging, and there isn't a fuel leak. Thanks!

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Poor fuel economy

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