Well, maybe not "off topic" since this is the general board, but anyway..... So, in the span of several months my otherwise miserly toyota has gone from upper 30's on the highway to upper 20's. It is completely stock (it's a corolla for eff's sake). The tire pressure is good and they are the factory size, the oil is fresh Mobil 1 5w-20 synthetic per specs, I have replaced the plugs with NGK iridium's per specs, the air filter is clean. The car has 75,000 on it and otherwise appears to be running perfectly fine. It feels like it has the same amount of power as it always has (which isn't much). It's a stick.
Just got back from my sister's and my brother in law has a diagnostic tool that hooks up to a laptop. No codes came up but it read that the engine had a 12% load at idle which he thought was odd since his Subaru shows zero load at idle. It may just be a difference in the ECU's (I really don't know). It also read that the throttle position was 16.5% at idle. That DOES seem strange as I assumed that all newish cars control idle with an IAC not at the throttle plate. Well, this is getting long but I would appreciate any thoughts as I can't arbitrarily throw money at my car at the moment.
thanks in advance