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Cy-Gor 08-22-2012 08:30 PM

The impossible: 04 Yukon XL Denali AWD
So we recently got some great dane puppies and we needed a new car.

Replaced my 99 dakota with the Yukon XL.

Love the car and it even gets OK mileage considering the size and the 6.0L motor.

I work from home and my "daily" driver is a Miata so i dont really care about city mileage at all.

What are the best mods to be done to this rolling brick that are cost/effort efficient?

What should i focus on first for the best gains when going 80 down the highway?

mcrews 08-22-2012 08:57 PM

What should i focus on first for the best gains when going 80 down the highway?


hummmm.......let's see...........oh I know!!!!!!!

slow down.

2000mc 08-22-2012 08:57 PM

might look at the differences on the xfe trucks and hybrid utilities to see how many of their differences you can replicate.
does your truck have electric fans or use a clutch? i think all the 1500s got electric fans in '05, but didnt know if the denali might have got it early

GRU 08-22-2012 10:40 PM

hmmm that's a hard vehicle to improve's heavy so avoid stoping...try to drive at a steady 45mph or so

mcrews 08-22-2012 10:44 PM


plan your life better and quit leaving late.
That way you don't have to speed.

unless your a p/t first responder in a small community........

Cy-Gor 08-22-2012 10:48 PM

OK, i will slow down to 75, the speed limit.

I would rather not take 8 hours to get where i am going so driving 45 isnt an option.

This is long haul cruise control driving. thats 90% of what this truck does.

Mostly looking for aero mods like a belly pan and closing gaps, but i dont know if that will help much.

ksa8907 08-22-2012 10:55 PM

lower it, front air dam, bump up the air pressure.

GRU 08-22-2012 10:59 PM

It's very hard to improve fuel economy with a SUV. I had a Ford Escape and didn't find many things work. I dont think closing gaps will help since the vehicle is so big.

Belly pan or big front air dam and a partial grill block is your best bet

2000mc 08-22-2012 11:11 PM

might try looking through forums for your truck, see if any of the tuners/programmers are helping mileage.

on long interstate hauls i try to follow the fastest traveling largest and/or worst aero vehicle i can find. before i got my scangauge i wouldnt of thought any less than riding someones bumper would have helped, but with it i can see that there is some benefit even several seconds back

2000mc 08-22-2012 11:22 PM

if you have a roof rack take off the cross bars
cover/seal up the opening in the bumper cover, dont think theres any coolers behind that

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