stiscooby

I have noticed over the last few weeks my car seems to be doing less to a tank.

I use to get around 220 miles to a tank of v-power (do roughly the same mileage each week, about 14 miles a day in 30-40mph traffic so probably the worst conditions to drive in) but currently the warning light is coming on around the 200 mile mark.

Could this simply be down to the colder weather? I have a 2004 STI with some mods including ECUTek re-map, fuel pump upgrade etc (340Bhp).

Or could it be signs of something going **** up?

joz8968

iTrader: (13)

Quite possibly.

Thing is, a 10% increase over 200 miles could come about simply because you've subconsciously been on the throttle a little more due to, say, slightly freer flowing traffic, etc.. This would be imperceptible to you over that period. By all means, if the difference was getting on for 15-20% or more, then I'd be a bit more concerned.

Check tyre pressures are at least at the recommended pressures - could have a slow puncture, etc. Are you carrying something heavy in the car, that you hadn't previously, etc., etc., etc...?

If you're adamant that everything is status quo (# Whaddever you want der de der de der... # lol), then test your lambda sensor/s. If they check out okay, how about a mini service i.e. new plugs, air filter, grade thinner engine oil...?

silent running

Or it could be that it's winter, and everyone's car loses mpg when you're constantly using headlights, heater, a/c if you have it, wipers, demister etc, plus the cold starts use more fuel.

joz8968

iTrader: (13)

Once again, I overlook the the obvious

Yes, this is invariably the reason (coupled with the cold denser air)