Hi Guys,
I dont know if i have an issue here but...
My dash reads an overall average of 30mpg but when i use an online calculator or calculate it on paper it should actually read far less.
If i put £20 of fuel in at 1.29/litre (standard unleaded) i personally get 80 miles, but if im actually achieving 30mpg i should be seeing 100ish miles.
Could the lost 20 miles be because of starting/idling and similar things or could i have a deeper issue?