Pulling the battery and MPGs - Honda CRZ Forum: Honda CR-Z Hybrid Car Forums
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post #1 of 7 (permalink) Old 05-08-2017, 03:30 PM Thread Starter
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Pulling the battery and MPGs

So I've noticed a decrease in MPGs and I thought it was due to bad alignment (30 mpgs at best). I had to disconnect the battery for about 30 minutes and noticed that my MPGs increased (about 37 mpgs). Should I be concerned?

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post #2 of 7 (permalink) Old 05-08-2017, 06:18 PM
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That's interesting; I'd just be happy, and see how it goes for the next couple of tanks. Could be that you just had some glitch going on in the electronics, and the reset of the battery put it back to normal. That's my take on it, and I'm sticking with it!

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post #3 of 7 (permalink) Old 05-08-2017, 06:31 PM
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ECU re-learn.
You may have run though a bad tank of gas, and not shaken the ill effects yet. Pulling the battery will reset some of the fuel trim tables (or whatever they are called - don't pile on me for nomenclature). As they re-build, you may see it decrease again, in which case it's time to do more research. Otherwise, happy motoring.

Other things that could affect the fuel mileage detrimentally over time:
-dirty air filter.
-dragging brakes.
-alignment and/or tire wear (that's likely a stretch, though).
-ambient air temperatures (decrease will reduce fuel economy).
-fuel changes.
-changes to driving style (Captain Obvious at your service).
-mechanical issues like spark plugs, sensor problems, etc (that would also likely throw codes).
-less boost from the hybrid battery.
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Last edited by CR-Z Canadian; 05-09-2017 at 07:54 AM. Reason: fix glaring typo
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post #4 of 7 (permalink) Old 05-09-2017, 08:02 AM
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Quote:
Originally Posted by FromHonda2Honda View Post
.....Should I be concerned?
By all means. I just don't know how to decide what about.
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post #5 of 7 (permalink) Old 05-09-2017, 01:35 PM Thread Starter
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Thanks guys. I'll fix my alignment this week and keep an eye out on things. I should probably look at my air filter too.

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post #6 of 7 (permalink) Old 05-09-2017, 11:21 PM
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There were 2 recalls a few years ago on the ECU. Has it been done and it not take it? It is probably the EDU re-learn like @CR-Z Canadian had mentioned.


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post #7 of 7 (permalink) Old 05-19-2017, 12:24 AM Thread Starter
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All recalls have been done to the car. It looks like the battery disconnect reset it though since my MPGs have increased and my auto stop is functioning better. *shrugs*
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