Hi All, This looked like the best place to put this: looking for either advice or to put mind at rest. Replaced the standard Continental Contact Sport's the other day with 4x Goodyear Eagle F1s. They are 235/35/19s. The Continentals had about 2-3mm tread all round and it's getting cold and greasy round here so I thought best to change them. My economy seems to have plummeted. To Hull and back from here (York) I would normally get around 41mpg, but lately 3 consecutive runs have been <37mpg. It seems to have a high rolling resistance. For example, there's a fairly steep hill from Hull to York and before in neutral it would just run away with itself, 50 at the top, 80 at the bottom, now it'll actually slow down at points down the hill. When I got the tyres fitted they lost pressure (about 3psi) a few times but now they've stopped that. I've put them at 39 and 36 (front/rear). My tracking measurement was +0.5mm on the fronts. I haven't had it perfected but can do. The old tyres were fairly worn but not bald and obviously new ones have standard 8mm tread or whatever it is. Is this normal? Is it just because the F1s have more grip and therefore drag more? Or is it a just a "run in" period with new tyres. Do they need more pressure? Any thoughts appreciated. Tag your buddies.