Used 17 GS - poor fuel economy

RiCorvette · 10-14-2017, 07:01 PM

Is there a fuse pull trick to reset the ECU on a 2017 Grand Sport Automatic, like pulling #5 and #20 on the Gen 5 Camaro?
If so, which fuse(s) or just disconnect the Battery?

Not sure if regular gas was used for the 'complimentary' fill up upon vehicle purchase from a (non GM) dealer, causing such poor fuel economy, but i'm getting only 9.7 mpg in mixed highway/city driving.

Or should I be looking for other problems (beside PbPeditis)?

h422694 · 10-15-2017, 07:40 PM

I had a C6 LS3 that got 15-16 around town on 87 octane and 30+ on the road using 91 octane. I only used 91 on road trips. I now have C7 Z06 and only use 91 octane that gets 13-15 in town and an easy 27.5 on road. I'm pretty sure there is a way to reset the map back to original and it is not done via fuses. I thought I read an article that indicated the ECM recognized the difference in gas and used the corresponding fuel map but could be wrong. Someone on here should know. Until then, I'd start looking at other possibilities.

REVVIC · 10-29-2017, 12:27 AM

If you have run through the complimentary fill up and at least one tank of premium with mpg data at circa 15 local and 30 highway, you're on track. If not, take your GS to a reputable Chevy dealer.

10-14-2017, 07:01 PM	#1
RiCorvette Drives: 2017 Corvette Grand Sport 3LT Join Date: Oct 2010 Location: Center of the known Universe Posts: 863	Used 17 GS - poor fuel economy Is there a fuse pull trick to reset the ECU on a 2017 Grand Sport Automatic, like pulling #5 and #20 on the Gen 5 Camaro? If so, which fuse(s) or just disconnect the Battery? Not sure if regular gas was used for the 'complimentary' fill up upon vehicle purchase from a (non GM) dealer, causing such poor fuel economy, but i'm getting only 9.7 mpg in mixed highway/city driving. Or should I be looking for other problems (beside PbPeditis)?

10-29-2017, 12:27 AM	#3
REVVIC Drives: 2014 Z51 Velocity Yellow Join Date: Jun 2013 Location: Tacoma WA Posts: 170	If you have run through the complimentary fill up and at least one tank of premium with mpg data at circa 15 local and 30 highway, you're on track. If not, take your GS to a reputable Chevy dealer. __________________

10-15-2017, 07:40 PM	#2
h422694 Drives: '16 Z06 7 Spd, 2024 High Country HD Join Date: May 2015 Location: Kansas City area Posts: 442	I had a C6 LS3 that got 15-16 around town on 87 octane and 30+ on the road using 91 octane. I only used 91 on road trips. I now have C7 Z06 and only use 91 octane that gets 13-15 in town and an easy 27.5 on road. I'm pretty sure there is a way to reset the map back to original and it is not done via fuses. I thought I read an article that indicated the ECM recognized the difference in gas and used the corresponding fuel map but could be wrong. Someone on here should know. Until then, I'd start looking at other possibilities.