Just to add my experience into the mix, my low mileage '98 manual LPT estate is returning around 27mpg at the moment - over mixed motorway, stop-start city driving and some A road cruising.
Thats with a failed lambda sensor and cat - on the other hand it is running with 5W30 fully synthetic oil and new Goodyear EfficientGrip tyres though, both of which will be helping a bit. Once the lambda sensor and cat have been changed I'm expecting closer to 30mpg overall.
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