: 2007 Drop In Gas Mileage



tw0053
05-07-08, 12:22 PM
I have 2007 Escalade that will be 2 years old at the end of May. Over the past few months I've seen my average gas mileage drop about 1 mpg from 14.6 to 13.7. The whole time I've been using premium from the same gas station. Does anyone have any suggestions on what could be causing the drop?

SWRidin
05-07-08, 12:52 PM
Did you make any modifications? Tuner/programmer, wheels/tires, intake/exhaust? These can adversely effect mpg.

Also keep up with regular maintenance: Oil changes, Air filter, differential fluid changes.

Or maybe you or another authorized driver is being too heavy footed these days?

hcvone
05-07-08, 04:23 PM
Do you check the air pressure in your tires every few weeks, a few lb drop in tire pressure could do that, use a good tire gauge rather than what the pressure sensors say. :)

hcvone
05-07-08, 04:24 PM
You really want a drop in fuel mileage put 24's or 26's on your truck. :(

tw0053
05-07-08, 07:21 PM
I haven't made any mods. I have a set of 22's on the truck. But like I said, since I've had it up until a few months ago I was averaging 14.6 and now I'm getting 13.7. No changes in driving habits or anything. I was curious to see if anyone has experienced something like this and brought it in or knew something.

tw0053
05-07-08, 07:30 PM
Do you check the air pressure in your tires every few weeks, a few lb drop in tire pressure could do that, use a good tire gauge rather than what the pressure sensors say. :)

hcvone,
What do you recommend for pressure? My tires say do not exceed 50. I've been running around 40.

hcvone
05-07-08, 08:38 PM
What size tires? In my 22's I run 36 lbs they are 285/45/22, on my 24's I run 40 lbs they are 305/35/24

tw0053
05-07-08, 08:56 PM
What size tires? In my 22's I run 36 lbs they are 285/45/22, on my 24's I run 40 lbs they are 305/35/24

They are 305/45/22.

hcvone
05-07-08, 09:07 PM
I would run 36-38, you are running 40, other than a little harsher ride that will work too

TSS
05-08-08, 10:55 AM
Just guessing, dirty air filter? Added weight such as putting the third row in?
Put on a little wieght yourself over the winter maybe? :hmm:

sj1400
05-08-08, 09:19 PM
Air filter may be suspect as mentioned above. Are you using the same brand of gas ? Sometimes they change formula's due to the season.

VGJackson
05-09-08, 11:35 AM
Some states are making Ethanol Blend manditory, maybe your station has switched? A 10% blend will make you lose about 1-2 mpg.

Palomar9
05-12-08, 12:46 PM
I haven't made any mods. I have a set of 22's on the truck. But like I said, since I've had it up until a few months ago I was averaging 14.6 and now I'm getting 13.7. No changes in driving habits or anything. I was curious to see if anyone has experienced something like this and brought it in or knew something.

Don't feel bad. My mileage has been sitting on 12.2 for a couple months now. Of course that's all local driving, sometimes in heavy traffic. A long freeway trip may push it up to 19-20.

tw0053
05-14-08, 08:21 AM
Air filter may be suspect as mentioned above. Are you using the same brand of gas ? Sometimes they change formula's due to the season.

I am going to try filling up somewhere else and see what happens. I checked the gauge for the air filter and it wasn't even close to red. It barely registered. Should I go by the gauge? Or could it still be dirty regardless of what the gauge says?

nicolaasdb
05-18-08, 01:33 PM
mine barely gets 10.3 out of a gallon.....hope it will do better when it's broken in!

airhammer
05-18-08, 09:30 PM
A dirty air filter won't result in a noticeable drop in gas mileage. The ECU sets the air-fuel ratio. If the filter is letting less air in then the ECU reduces the amount of fuel to compensate. A dirty air filter will reduce the top end power available, not the mixture or efficiency.

When air used to go through a carburetor a clogged air filter would mess up the air fuel ratio and therefor the gas efficiency but not with a modern electronically controlled engine.

scroitoru
05-23-08, 01:41 PM
summer is upon us, so it might be your AC running you down on mpgs. as I read, even though is off, the climate control is still running?!