There will be a slight difference in your total average, but unless you stayed in an idling position for extended periods of time then the overall average would have such a minute difference that it would be about the same.
replace timing chain
you have a cylinder misfire
Ask this question again specifying what the car is.
No. However it can affect the idle and power. It will affect the air-fuel mixture resulting in an increase in emissions and gas mileage.
It could be a dirty air filter or a dirty throttle body.
The combination of highway gas mileage and city (stop and start) mileage.
1987 ford f150 5.0 starts at 1500 rpms, then idles down to 700 rpms.truck idles low when put into gear and also stall when i stop from time to time.any help will be greatly appreciated.
it is possible to be the brakes or the transmission have it checked by a mechanic.
A check engine light (Mil Malfunction indicator light) does not necessarily mean that something in the engine will break or is broken and your car will stop. It could be a malfunctioning anti-pollution device witch will not affect your driving but it WILL affect your gas mileage. There is a LOT of reason why an MIL will turn ON suddenly so it could be anything. A ROOM fuse is the fuse for the illumination of the interior of your vehicle (dome-light, trunk-light etc).
Probably a bad idle air control valve.
Tire wear, vehicle handling and gas mileage.
If it is the check engine light is different than the Maint req'd light (for oil changes). The MAINT REQD light is simply a timer for oil changes. Here's how you get reset the MAINT REQD light: 1) put the key to the ON position 2) press the mileage reset button on your cluster so it shows total mileage (not trip) 3) put the key to the OFF position 4) press and hold down the mileage reset button, leave it pressed 5) put the key to the ON position 6) wait until the mileage shows 000000 and you can stop pressing the ODO button