New battery helped my MPG

[BobSassafrass]

like the earlier poster said....it is probably the ecu thing

Like I said earlier I have reset the ecu multiple times. Anytime I have installed or uninstalled a part I reset the ecu just to make sure I get all the ebenfits I can.

A dead battery can put alot of strain on an alternator = needs more power to turn, like AC...it's not totally far fetched..

This is exactly what I was thinking, since the battery wouldn't hold a full charge the alternator is having to due extra duty than it did before. And since it is summer now and I'm using the a/c 10x as much as the winter it's much easier to see.

my stock battery lasted 4 years to the day.

Mine was most likely dead when I bought the car last year and it's an 02 so 4 years sounds about right.

[trickkykidd.02]

which model OPTIMA di you guys buy..? I thought I remeber something about not seeing one listed for our model?

red or yellow.? does it even matter.

I bought lightweight battery for stock replacement and I think it is starting to crap out.

c...

[lleron]

I have a yellowtop that is made for our cars (I forget the number). The guy at the shop told me that they do not make a red top that is the stock size, although I'm sure you could get creative.

[devinblue]

I have a yellow top in both my explorer and truck back home. Gonna put one in the EP real soon!

[AzNCrAzYcOoLeR]

my stock battery lasted 4 years to the day.

mine lasted 6....

I switched mine, no difference for me...

[illusionsoflife]

mine lasted 6....

I switched mine, no difference for me...

mine lasted 6 as well. went to disnyland for 4 days. took the girls focus up there. came back. tried to start and no go.

[si4life]

Newb question, is there a way to check to see how much life is left in your car battery? i have been running the oem battery since i had the car 4 yrs and 2 months.

[benkieboy]

im not sure if there's a way to see the battery's life. i think once it's dead, it's dead.

[talonXracer]

The better mileage is from the alternator not having to work so hard.

[benkieboy]

i never knew that could make a big difference. at least now i know

[BobSassafrass]

I wouldn't say big difference but it was a difference. And you can use the little clear window to atleast see fi the battery is dead or not. Most auto parts stores will test a bettery for free though along with the alternator.