I've just brimmed my tank for the third time, and have the following observations.
1. The trip computer is 8% optimistic, and that is assuming that the mileometer is accurate.
2. Doing much more fast dual carriageway travelling than is normal for us, we are averaging 65.6 mpg (real) [and 71.2 computed]
3. Today, having filled up, with a warm engine, and driving on Norfolk country roads at around 40mph (when there was nothing behind!) for 12miles , The computer claimed 98mpg!
4. Does anyone know how a trip computer works? Does it actually measure a flow rate of fuel, or does it calculate a supposed total usage from the amount that the engines computer system is sending to the injectors. If it is the latter, and other peoples are giving accurate readings, does this mean that mine is actually injecting 8% more fuel than it is supposed to.
5. I am finding that after driving an old petrol punto, this engine judders when I slow down for junctions much earlier than I would expect (around 1000rpm) Is this normal? It is taking a bit of getting used to. Also could other users tell me what is the lowest speed that their car feels 'comfortable' in 5th? Even though peak torque is reached at 1500rpm/40mph, I find that at 35mph, in 5th, the car feels very sluggish.