Specially designed for diesel 4x4s, as well as other vehicles, Tunit’s fuel saving options are said to save up to 12 per cent for some customers. If you want to check out what the modification could save you, the company now has an online fuel calculator where you can input your personal driving details to calculate any potential savings. Once you’ve done that, it will be a case of booking an appointment. Tunit says that the conversions do not interfere with original manufacturer’s engine equipment. Full details (and the new Fuel Calculator) can be found on the website, or give the guys a call on 01257 274100.