Originally Posted by David K
Agree... but if most folks in a 4 cyl. Taco get 20-25 mpg, you got to wonder why he is only getting 15 mpg, right? 15 mpg is all I get if I am doing only city (stop and go) driving... but I have a double cab 4WD V-6. Once I get on the highway and cruise... my mileage instantly improves to 17-19 mpg.
With all due respect, I don't have to wonder why he is getting 15MPG. I usually don't read MPG threads or concern myself with fuel economy on my truck but I mis-posted so I had to offer something.
There are too many variables to troubleshoot fuel economy inconsistencies in any fueled engine. Weather conditions, Altitude, Geographic terrain, Driving habits, Tire pressure, road conditions, Acceleration, Stop and go incidence, braking, trip distances. I would bet those who live in San Francisco replace brakes more often and get worse fuel economy than one who lives in Texas.
Fuel economy is a very sticky subject with too many variables. KIA is getting sued for misrepresenting theirs. In any case my "advice" would be to take it to someone who fixes these for a livelihood, If there is a legitimate cause and effect, a mechanic will find it in these computerized vehicles using error logging. Anything other than that has to be habitual or environmental.