Ok, We have lousy fuel economy on the wifes 53 plate vectra. I had a full service done, no improvement. i then noticed the temp guage was temperamental, so replaced the thermostat and temp sensor (£45)
Fuel economy is now up from 25 mpg to 31.2mpg,
This is based on comparing two weeks commute of 250 miles each week
but this is proper gentle motorway driving 70mph max,with CC on, no heavy acceleration at all. my daily commute is a 62 mile round trip down the M1. Does anyone else think this MPG is bad?