2007 Boxster 987 3.4s manual - poor fuel consumption.

[billzeebub]

Seems excessive. On a recent roadtrip to Cornwall (from Kent coast) my 3.2S Averaged 32.9 mpg for the whole trip. Had the roof down for the entire week aside from about 20 miles (840 miles total)

[AlR26]

Doesn't sound completely terrible, but it does seem a little on the low side:

My 987.1 2007 3.4S normally does around 25-26 mpg on the motorway on cruise (with the roof up), obviously quite a bit worse around town or being driven hard. A 2005 987.1 3.2S I know well does a little better. My old 2003 986.2 3.2S would do 31-32 on motorways on cruise with the roof up which I think is just due to smaller wheels / tyres (18s vs 19s), more camber, slightly less toe, lower rolling resistance tyres (Michelin PS2 vs Falkens) and a slightly smaller shape and lower drag coef.

Assume you have checked the tyre pressures and the tyres aren't scrubbing and wearing hard on any edge / corner of the car?

[Trev450]

andygo said:

Been really pootling about today,- A roads, b roads, driving very sedately with the odd squirt of beans. 19.5 mpg. Somethings not right, but wonder what it could be?

I presume you have a newish air filter in place and have checked the maf sensor is clean.

[andygo]

Not checked the MAF sensor, but air filter has only done about 7k. CEL hasn't been on, but I did have the AOS changed before I bought it, so its possible the MAF is oiled up. Thought cleaning of them was generally ineffective.