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The most likely problem is that the gas you bought most recently was a "summer blend" designed to give you LESS MPG! That's because the companies want more profits, NOT better fuel economy, which would give those companies LESS profits instead of MORE profits!
When the battery went dead you engine control module lost all learned programming, drive it for a few weeks as normal to restore this and the mileage will be back to normal.
I have a 99 explorer with V8 that runs great! and I get
a whopping 13mpg. But it has high miles. So I was
going to change the catalytic converters as they may
have started to plug up. And any exaust restriction
will drop your mpg, even a bent tailpipe will cause a
drop. There are other possible reasons for this, such as the o2 sensor sending a signal to the pcm calling
for a more fuel rich, air fuel mix than neccesary. Or
the temp sensor failing to signal that the engine is
at operating temp, and stays to some degree in cold
start mode. But either of these conditions would be
noticed through dtc codes- a smell or engine performence. I hope I was of some help.
Good luck.
Air filter?
And any car I have ever owned with a timing belt has shown a noticeable drop-off in MPG when the belt had some miles on it.
I would do what you have done but added (or at least eyeballed) the air filter.
If that didn't bring it back, the timing belt was next since it doesn't take hardly any stretching to throw off the valve timing and it is critical to performance and MPG.
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