bbschevy1

my 09 Sub shifts smoother and seems speed up faster than before, but also burn more gas. is it normal? Last night I did about 90 mph on highway, and it seems handle much better than before. Still gas burns much faster.

Has svc dept done something to my truck?



thanks..

oldchevy

At 90 mph you will burn much more gas than at 55 mph.

kevinkpk

Are you comparing this 90 mph now to 90 mph before?

bbschevy1

I am comparing in general. After changing, my Sub accelerated much smoother without any chocking and seems pick up speed faster, but same time, gas burns faster. I am just referring that when I did 90 mph, it seems to handle better than before. does it have anything to do with this?

thanks.

kevinkpk

speed = rpm's, rpm's = gas mileage