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Why is the fuel consumption on my 308SW so high?

I run a 2009 Peugeot 308SW 1598cc petrol. I have been very pleased with it, apart from the fuel consumption which has never exceeded 40mpg even on a long run, including motorways. I only do about 5000 miles a year so it's not breaking the bank, but nevertheless I am disappointed that it does not offer better fuel consumption. Am I wrong to expect any greater mpg, or do you think something needs attending to?

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We have a facility for drivers to submit their mpgs into a databank. The real life average for the 1.6VTI in a 308SW is just 32mpg so you are actually doing better than average. You might improve this a bit by running on Shell V-Power Nitro Plus, which is more expensive but can actually be cost effective, as well as keeping your fuel system cleaner and giving more power and torque. The databank is here:
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