Tell us the best and worst fuel prices

• Whatcar.com needs your help!
• Tell us Britain's best and worst fuel prices
• Highest so far: petrol 108.9p a litre; diesel 114p

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With the national average now topping 100p a litre for petrol and 105p for diesel, whatcar.com is on the look-out for Britain's best and worst fuel deals.

Word has already reached us of an outlet in Merseyside that is charging 114p for a litre of diesel, while one retailer in Hertfordshire wants £108.9p for a litre of petrol.

In contrast, there are reports of petrol costing as little as 94.9p in parts of Scotland, and diesel at 99.9p in Northampton.

As a result, someone switching from the most expensive to the cheapest fuel station could be saving around £7 a tank.

We want to know if your local petrol station is charging more or less than any of these figures - and we'll publish the results.

Just let us know the station's name, location and the prices it's charging by clicking here.