Low mpg

[adnic69]

Hi Guys

Have been looking around on here for a while now. My fiance has a PH1 172 sport. Mods are air filter and lowered. Car has was running fine for over a year with no problems at all. Recently it is running a little rough and is returning poor mpg(29) according to the comp. Normally it's around 35ish. I did an ecu reset and it's recently had new oil in it.
Any ideas?

 

[Fletcher]

When was it last serviced?

 

[adnic69]

Last service would have been 3 months ago. That was new mobil 1 oil, filter and cleaned the air filter. Before that it would have been a year.

 

[Timmay]

cold weather affecting it?

 

[adnic69]

I did wonder that but I don't think it would drop that much. Don't remember it doing it last year.
True that weather can affect it though. Remember when I had the TVR it would do 240 miles to £67 and when winter came on the same daily drive it dropped to around 120miles! Then went back up come summer.

 

[adnic69]

Where is there a good specialist around Bedford to take it to for a going over?

 

[riz]

poss lambda sensor amybe, try Mark FIsh in Harlow,

 

[caister]

I reckon it could be the lambda sensor

 

[Slammed172]

Shouldn't be that low.

I don't drive like a girl and i get more that 29. So unless she is booting it a lot then possible lambda sensor as said, definally not the weather.

 

[gussy]

am geting 21.5mpg out of my 172 an if you think thats bad its now showin 9.1mpg but my car is in need for a service