Record, Longest Distance Covered on a Single Standard Tank of Fuel
Peugeot 406 HDi Diesel
2,348.3 km’s covered in 36 hours, on less than a standard tank of fuel from Melbourne to Rockhampton Australia
I know its the HDI and it being Aus, I’ll bet the driver never had to change throttle use.
But it shows what the 406 can do. Theres a good chance that your car does have a fault of some kind, but I have to ask, how do you drive it? Lots of traffic, stop start driving? High speed driving, motorways etc?
Basically, leave off the brakes, coast in gear, try and anticipate further down the road, and don’t change your throttle loading. One of the biggest savings is to be had from keeping a steady throttle. Always used to add a a couple of MPG on the computer of the ex’s Clio when I drove it, mainly because she was incapable of keep her foot steady!
Not suggesting your aren’t already trying this things, but I used to get 50+ out of my old 306 Dturbo quite easily.