I only get about 23 mpg highway, and 21 city. For a 5-speed I
think that's pretty shitty. 3 years ago I could get 28
I don't get any codes, but my plugs, wires and O2 sensors
are 3 years old. But I don't really think that's a big deal.
If there's no codes, the sensors are fine, right? I do run more
negative camber and toe-out than most people, but not enough to destroy the tires or anything. Also the front brakes do rub a little if you take the wheel and turn it with your hands, because they are warped a little. But I can't
see all that taking away 5 mpg, do you? What do you think, I'm no engine ace. What are the most common causes.
As the O2 sensors age, the voltage output drops off ever so slightly. Not enought to light a code, mind you, but enough to make the mixture appear more lean than it actually is. The ECU compensates by enriching the mixture. You lose HP and MPG by running extra rich.
I think this exists on my own Probe; the HP is down, the A/F ratio is extremely rich past 3000 rpm or so, and the MPG stays around 20. New plugs, new wires, new cap, check & reset timing has no effect on (my) milage. But I'm not ready to change the O2's yet.
Yeah, I used to be able to get 425 miles on a long trip, now I can only get 350. New wires didn't change this. I do suspect I'm running rich though, because at my last emissions test it was discovered that my hydrocarbon reading was almost over the limit.
It could also be that you have been getting some bad gasoline. Also, in some areas, they use different blends of gasoline depending upon the season. I dunno. But I tell you what, 23mpg is what I get with my ATX and I'm thrilled.
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