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Discussion Starter · #1 ·
hopefully this hasn't all ready been answered somewhere else and if it has pointing me in the right direction would be a great help.

I recently bought a used 07 silverado 1500 ext cab 4.8l with 16k miles on it in vegas. the week i was there driving it around i got about 17-18 mpg in town and as i drove it from vegas to cali i got ~21mpg. my problem is that after leaving cali to head home to el paso every fill up from there my mileage dropped. first fill up was 19, second 18, third 17 and has now settled right at the 17 mark on the highway and i am down to about 14-15 in town. I am wondering if the fuel management system in the computer hasnt compinsated for the altitude changes and isnt running quiet right. and if this is the case does any one know how to fix this. other wise does anyone have any ideas on what the problem might be. i did drive with the tailgate down the whole trip. also when i got to el paso i installed the K&N drop in filter.

Any help on this would be great, Thanx
 

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Discussion Starter · #3 ·
thanx Charlie, yeah i was really wondering about the wind and i was pretty sure the air/fuel was suppose to adjust on the fly but it just really baffled me that the differences were so large. as i was reading along yesterday i did find a post that said something about driving habits and the transmission learning how to adjust to my driving style so maybe this is it. We are going to do a test in the next couple weeks...im gonna let the feather footed wife drive us to some wineries in NM and see how different the mileage is then :lol: and then we are going to be driving back to vegas in March for my brothers wedding so we will see how that goes as well..we will be getting the tonneau in a couple weeks also, so i have heard that the y do and dont help so i guess we will see on that one as well lol...thanx again for your input
 
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