My 2007 Tahoe 5.3 gets 12.9 mpg city and 18-19 highway. When I first got it, it was better. This is just the nature of the beast. If you want better mileage stay off the pedal some. Put the DIC on instant fuel economy and keep the number up as high as you can as often as you can.

 

What kind of leak? I dont smell gas in the morning and the fule system on Silverado is pressurized when you start the car.

 

whta do you mean "Put the DIC on instant fuel economy and keep the number up as high as you can as often as you can"? I dont think I can change my DIC. <!-- / message --><!-- BEGIN TEMPLATE: ad_showthread_firstpost_sig --><!-- END TEMPLATE: ad_showthread_firstpost_sig --><!-- sig -->

 

He meant watch your instant mileage on your display under the guages.

 

I dont have the option. I just have the LT1 which only has a reset button for the odometer. It is a very basic truck.

 

So how are you calculating your mileage? just miles per tank?

 

i found the best mileage i get is when i drive sane, and when i quite worrying about it,

 

Yep, if I drive like theres no tomorrow Ill get 7 MPG, on the other hand I will get and average of 14 with a 6.0. if I use it lightly. Its amazing that you can hurry like a bat out of hell and you only get there 5% or so faster. I am not saying you drive crazy, I just think too its just how you drive it.

 

When your poor mileage started was it about the time fuel supplers sterted putting ethynol in the fuel,i had a 1993 4.3 and with 10% blend gas i lost about 15% mileage

 

07 5.3 CC Z71 LTZ. Is there anything I can do about the MPG drop. Everything is clean - fuel filter, air filter, oil. Or is it just because of the ethanol?