99 Yukon/Poor Mileage/Rear Door Panel removal

[SenorPescador]

Hola, just got a 99 Yukon, nice truck, not so good mileage, my question is any knowledge on increasing mileage, new plugs... wires? put on a water vapor injection? or maybe even my HYDROGEN fuel cell made out of 6" well casing and SS plates. I need to remove door panel to get to lock mechanism, frozen up, also...... thanks from Burgaw, soon back HOME to El Salvador and I will most likely drive this vehicle only 3200 miles to Iztapa, Guatemala then 5 hrs to La Libertad

 

[Miami-Dade]

Welcome from Miami Beach!

 

[SenorPescador]

Welcome from Miami Beach!

gracias

 

[east302]

What kind of fuel mileage are you seeing?

 

[jaeross57]

What kind of fuel mileage are you seeing?

I'm sure you have the 5.7 engine? Any modifications that you know of? Mine is heavily modified so I know I'm going to get crapy mileage but I had a 96 model and I think I got maybe 14 - 16 mpg on a good day.

 

[SenorPescador]

im getting maybe 12 i will change plugs and new wires and coil pack,

What kind of fuel mileage are you seeing?

 

[SenorPescador]

y
es same motor, 350 but crate motor, only around 50K on it

 

[east302]

im getting maybe 12 i will change plugs and new wires and coil pack,

Just driving around town (versus highway) 12-13 sounds about right. If you have larger tires than the stock size shown on the door jamb label, that will throw off the odometer and your calculation.

 

[exp500]

My fleet is pretty consistant at 14.5- 17.5 MPG. If yours is 2 MPG less, It needs Cap/rotor/wires/plugs.

 

[SenorPescador]

I will most likely put on my ** cell 6" well casing 17 SS plates, plastic threaded rod, nuts and washers, tubing i will look for a foto