I’ve had 2008 crossover from brand new for 3 weeks now and my mpg is all over the place. It says I’ve got 105 miles in the tank. Go for a 3 mile trip , then it says I’ve got 85 miles left. Go for another 5 mile trip then it says I’ve got 63 miles left. It’s been back to Peugeot . They rebooted something. But still the same. I’m scared to go on a long journey in case it runs out of petrol . What do I do.