Poor MPG

[theduck]

since putting on my new alloys (gone to 15" from 14") my mpg has dropped from an average of 31mpg to an average of 27! is this due the extra width of the wheels or is something wrong??

 

[16v_jon]

when was it last services and had plugs for example ? my 172 hybrid will get 35 easy

 

[theduck]

last plugs around 5k miles ago, oil and filter change 12k miles ago. Other than that i dont know because the shitty garage i bought the car off said it had full service history, and then when i collected it (after i handed over my money) he handed over the service history, 2 MOT certificates, once of which he'd had done that day

 

[16v_jon]

i dont look at the mpg on the computer just devide how many miles i get out of a full tank by 11 and thats more accurate .
what sort of fuel are you putting in?

 

[theduck]

just normal 95 ron, normally either asda or bp. Dont like shell's 95 ron as it makes the car rough as fook