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Amazingly, the sun is shining and so it’s perfect weather to sit in the garden and catch up on the latest news in the car world, courtesy of Diesel Car. And what an issue this is, with the spotlight on diesel tuning and economy driving. We’ve got a comprehensive guide to everything you ever wanted to know about tuning, a reader’s modified car and a guide to economy driving tuition. There’s a look at low emission zones in Europe and we explore the history of the Fiat diesel engine. There’s also a first test of the Volkswagen Golf Estate, and we’ve driven the Citroën C4 Picasso, Suzuki Swift 1.3 DDiS and SEAT Leon SC on UK roads for the first time, together with Chevrolet’s chunky new Trax and Renault’s all-electric Zoe. Peugeot’s new 2008 crossover goes head to head with Renault’s eye-catching new Captur, and there’s On Test reports of the brand new Skoda Octavia vRS, the Mercedes-Benz CLA-Class, Mazda6 Tourer and Hyundai’s new three-door i30. We’ve also got test reports on our long-term fleet, including the Kia Sorento, Mitsubishi Outlander, Peugeot RCZ, Renault Megane Sport Tourer, SEAT Leon FR and Skoda Rapid, as well as a comprehensive used car buyer’s guide for the Peugeot 207 1.4 HDi.