I'd honestly like to know how? The most amount of miles to a tank I achieved with literally driving like a granny was around 340 to a tank iirc. The tank is 50l in capacity so on a rough calculation that is circa 30mpg. On the dash the car was saying I was was around 32/33mpg.
To get 45mpg you'd have to get around 500 miles out of the 50l tank and I'm telling you for a fact that is impossible.
If these cars averaged 40/45 there is no way I would have changed to running a diesel which is now comfortably getting 50mpg on a run.
Shawrey
Are you draining the tank before a fill up? It's 50l, but the fuel light comes on quite early; when there's still about 25% remaining as far as I can work out. So if you're getting 340 miles to a "tank", it's likely you're not using as much as you think, unless you always roll onto the forecourt on fumes.