Normally the car would avg 32mpg but today i checked again and its around 25.
Front nearside tyre is leaking air so i have to fill up every other day but im going to get front tyres changed this friday. That alone couldnt cause such a drastic drop in mpg, right?
I looked in the engine bay and after taking the engine cover off, i noticed its a bit moist in the place where spark plugs go in. Also, one of the connectors that goes into headgasget? is also a bit moist and the screw right under it a bit moist too.
I barely know anything about cars so im looking at some advice. What could cause such a big drop in mpg.
Temperature getting colder usually massively increases my mpg but can do the opposite affect. As you said tyre pressures being off can affect mpg by a decent amount. The type of fuel put in can hugely impact it. I found in my area my vehicle hates Tesco fuel but loves Morrisons and BP fuel ( difference in mpg is 10 ). Also service history. If the vehicle is neglected that won’t help either. Spark plugs should be changed every 40-60K so if they are massively overdue that could be affecting it. Tons of factors sadly