That's strange Tom..... You should be getting better gas mileage.
Cause and effect could be taking place here. Are you on the gas more? I know when I installed my dual exhaust, it was supposed to get better mileage, but I've gotten worse mileage because I'm on the gas more. I love the sound, so I make it sing whenever I can......
Has anyone else seen reduced fuel economy after installing underdrive pulleys?
I've noticed about -2mpg difference from the underdrive pulleys installed 1 1/2 months ago.
I ran fuel system cleaner through it. Taken it to get the injectors cleaned. Checked the spark plugs, but can't find where the gas mileage is going.
how long since you cleaned your air filter?
I can always tell because my mpg drops dramatically when it needs cleaning . ..
__________________
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
The only thing that may have changed from your installing the pulleys is the belt is gripping better, meaning there's less slippage on the accessories, or the tensioner may have gotten off and is creating excess friction, or the pullies are misaligned and the belt is getting a good side rubbing, creating more friction. .
__________________
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
Has the temperature dropped recently in San Antonio?
__________________
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
It takes longer fo rthe engine to heat up, and the electric choke comes on more often and for a longer period of time.
When it gets cold, you may want to swap in your old intake . .. .
__________________
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
It takes longer fo rthe engine to heat up, and the electric choke comes on more often and for a longer period of time.
When it gets cold, you may want to swap in your old intake . .. .
If the position of your MAF is the same, you can just swap in the old filter section and leave the rest . ..
__________________
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
Underdrive Pulleys and Fuel Economy 
