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Would putting a chip in my 2010 hyundia elantra E C U help gas mileage

No.

Inflate your tires, maintain vehicle and not drive hard all the time will be best for mileage.

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Thanks

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I do all that and get 27 miles to the gallon is that good.

I get that with my old Toyota 5 speed with 337,200+ miles... and I dont have a car payment for last 15yr :D

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does that mean i should do better i only have 6000 on my elantra