HELP! dealer reset ECU -now gas mileage is poor

Like the title says -there was some kind of recall on my 2012 AC that required a reflash of the ECU ...I was getting 20 mpg avg before that ...now I am lucky to get 15mpg average..E-mails to the service advisor at the dealer have not been returned...I dont think they know what to do about it...

any suggestions ? ideas ? etc...

 

Give it 1k miles or so then reevaluate

 

that reflash is for the vsc system that has nothing to do with mpg

 

Perhaps if he lost 1 or 2 mpg, but 5mpg is a 25 percent drop. I think the answer is in the title, take it back to the dealer.

 

its been 4 tanks of gas so far and it is improving slightly...got 17.5 @ fillup yesterday

 

i work at a dealer and i know what recall they did. they reflashed the vsc system

 

did they check and possibly lower the tire pressure while they had the truck?

 

When you reflash the system, the vehicle has to relearn and adjust fuel/air ratios and such. This takes a little time. When I worked at Hyundai, we had recalls and TSBs requiring reflashes. It was a conversation I've had with customers thousands of times over the years. Shame on them for not telling you what to expect.

Have you noticed higher/lower revving, different accelerator response, shift points, etc?

 

Just more sluggish response on acceleration....

 

You burned 4 tanks in 1 day?!?

 

"You burned 4 tanks in 1 day?!? "

no this has been going on a while...like 6 wks now

 

Ahh

 

Did anything ever happen? Did it resolve itself?

 

Since this is the case, should I have the dealer reflash my truck since I put a header on my 2.7??

 

my mpgs finally recovered to 20...but it took a LONG time.....your choice...

 

they wont reflash for a header upgrade.