MPG drop....

[Screwd up 6]

Just wondering, I got my truck back in November. Since then I have put on a little over 7000 miles. I was getting around 16.5-17 mpg for the first month. I was told after the engine breaks in, I would prob see better.

Well, I have checked my gas milage the past 3 tanks and the highest I have got is 15.3 or so. I have put on exhaust, and know most people get a little more heavy on the pedal to hear it, but I dont find myself doing that much. I actually played the "2000 game" last tank, and that was my highest mpg at 15.3.

NOTE* I havent checked my tire pressure, and havent changed my air filter.

^^Could this be why my mpg is dropping?

I have a SLP closed intake coming in tomorrow and will keep track of the mpg increase/decrease.

I hate to ask stupid questions like this, but I am just seeking advice. Thanks in advance!

[GMCwantsLS1]

Tire pressure makes a huge difference in my trucks!

[Screwd up 6]

Do you run it at the recommended pressure on the inside of the fuel cap?

[GMCwantsLS1]

I hate to say but no! I run what the sidewall max is or higher. I however do not suggest that you run anything unsafe (disclaimer).

[RedHeartbeat]

Gas mileage drops as you add weight to the truck, too. Be sure you check the mileage through the same methods and routes if possible. Try 93 octane vs. 87 octane. Lowering the truck often helps the MPG due to less air under the chassis creating drag.

[ChevyLee]

what size tires?

[Screwd up 6]

I hate to say but no! I run what the sidewall max is or higher. I however do not suggest that you run anything unsafe (disclaimer).

Im so going to run them way high and YOU are the one to blame haha jk.

Gas mileage drops as you add weight to the truck, too. Be sure you check the mileage through the same methods and routes if possible. Try 93 octane vs. 87 octane. Lowering the truck often helps the MPG due to less air under the chassis creating drag.

Yes, my conditions are 90% the same. Varies very little. I ran 93 last time

what size tires?

Sadly the factory **** tires. GENERAL 245/65/17 I believe. WORST TIRES EVER MADE!!!!I can squeel the front ones more turning into a parking spot than a lil honda can off the line. hahaha

[Screwd up 6]

On a side note, just for giggles, I filled up right before I came home from downtown.

60 miles an hr, about 5 lil stops in the city, and 33 miles later...I filled up again.

18.77 mpg. This is a nice number, but this was just for giggles. The other data is from my "average" driving.


Hopefully after I get the SLP intake on tomorrow, next tuesday night on my way home from school ill do the same thing and see if the strait 33 mile trip has any diff.

[GMCwantsLS1]

Also wind makes a huge difference. A strong headwind can eat up 2-3 MPG easy. Try drafting behind big trucks.

[Screwd up 6]

It has been pretty windy this week with the cold front coming in.

Now its starting to make a bit more sense. I just thought that was a huge drop out of no where.

Thanks for the help