i have a 2003 si when i put on CAI and cat back exaust i lost like 10 mpg is this normal?

 

reset your ecu. you should actually get a little better gas mileage. unless you are shifting at higher rpms.

 

there will be a little (very little) mpg loss because more air means more fuel. at least thats what i would think. resetting the ECU will deffinently help.

 

better breathing allows for better mpg. more fuel would result only if he guns it at every stop light or he put new injectors in.

 

How do you drive? Keep it between 3-4k and your butter.

 

30-31.5 is the best our cars will ever get unless you change gearing

 

I put a CAI on a 98 dodge neon for a friend and forgot to reset the ECU perfect example of bad gas mileage.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18CXr &raquo;</TD></TR><TR><TD CLASS="quote">30-31.5 is the best our cars will ever get unless you change gearing</TD></TR></TABLE>

Thats exactly what I get with highway driving.

 

You should be getting better mileage in theory, but it's harder and harder to not bring it to the red all the time the more mods you put in there.

 

it's all about self control i drive the car easy but i still punch it once a while. my avg mpg has been 26-28 mixed city (about 20miles) and highway (120miles) per week.

highest two times i've gotten are 31.something while on road trip to indiana for meets. lowest i've gotten is 19mpg.

 

25.5 mpg on my last two tanks with Toda kit, mostly city driving and very little self control