Hi,
I have a Kia Ceed 2010 Petrol Automatic, CVVT 1.6 and my MPG went down to 20. Sure I drive to work nearby for like 7 minutes, so the engine barely warms up, but before it was around 25, now barely gets over 20. I have a scanner and wonder what should I look at in live data to maybe find an issue, as car shows no codes, runs smoothly (unless AC is on, needs a refill). I have cleaned the throttle body months ago with an MAF sensor cleaner, cause I thought I had one, when I actually dont. The only sensor i see just before the throttle intake, is like a nipple inside the tube, which i sprayed as well. Only 64k miles on the clock.
Cars will lose a little in terms of fuel economy over the years but that's pretty low milage to drop off like that. One thing to check is to make sure your tires are in good shape and inflated properly. I know thats one thing that could cause sudden loss of MPG's also if your car is running rich that could be one thing to check for that could cause it and the only other thing I can think of off the top of my head is if you have a lot of stuff in your car. If you have too much extra weight that could cause it too. One last thing is if you only drive short distances you might need to take the car on the freeway for and hour or so and maybe try a fuel system cleaner while your at it that will help blow out any built up carbon on the pistons. Hope that helps.
@jacksonishere
Thanks, had brand new tires installed Continental EcoContact 6 for fuel economy for this reason. Check with 12v Inflator regularly, all good. Will check the richness of the fuel system with scanner then. And no I drive alone to work. Maybe I need to ease on the accelerator a bit.
I've done MPG testing in my car and I average 30 but I've dipped as low as 26-27 when I don't feel like I'm driving much faster at all... and try and account for stop and go traffic everyone except for hybrids get worse MPG in stop and go traffic and intercity driving.