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The tyres usually need changing once a year. I usually check the pressure after they've been changed and then again fairly regularly although not every time I fill up (every fourth night). I'd be inclined to rule out tyre pressure but I didn't realise the impact could be so significant.

Also, in this instance, we're talking about over 10% deterioration in consumption. My on-board computer tells me how many miles the tankful will get me. It's usually 800m+ but lately it's showing under 700, averaging 680-690. (I usually fill up at the same garage after doing the same 85m journey.)

[QUOTE="Desert Orchid, post: 2101672, member: 65242"] The tyres usually need changing once a year. I usually check the pressure after they've been changed and then again fairly regularly although not every time I fill up (every fourth night). I'd be inclined to rule out tyre pressure but I didn't realise the impact could be so significant. Also, in this instance, we're talking about over 10% deterioration in consumption. My on-board computer tells me how many miles the tankful will get me. It's usually 800m+ but lately it's showing under 700, averaging 680-690. (I usually fill up at the same garage after doing the same 85m journey.) [/QUOTE]

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