just wondering, this may seem like a stupid question to many of u .. if i install comptech headers, and a comptech exhaust system would i get less mpg then i do now? thanks

 

in my experience a more effecient and free flowing engine should get better mileage. Assuming you can stay off the gas of course :-p

 

i've actually heard it goes both ways. all depending on your style of driving.

 

it should go up if your driving syle stays the same

 

Point of perspective...

3 years ago, when my CLS 6MT was fully stock, I got between 28-30/20-23 MPG for freeway/around town.

Currently, I'm running with CT i/sc/h/full-catback and get between 28-32/20-24 MPG for freeway/around town when I'm light on the throttle. However, gas mileage drops off a bunch when I'm

If your driving habits don't change after modding, then your gas mileage will be about the same or slightly improved. However, with a modded car, there's a greater desire to "See what this baby will do".

 

thanks guys. my 03 cls is getting around 14 mpg around town. im taking it back to the dealer on wed and they are gonna check it out but they said that it sounds about right. sometimes i like to see what it can do but usually im light on the gas. just wondering what everyone else is getting for an automatic cls

 

no less than 300 miles out of a tank only city driving

 

thanks. ive been getting 200 for a full tank.. cant wait to get this problem fixed .

 

That's worse than I was getting. Check your air filter. I get about 17 to 19 in the city and up to 32 on the highway. I'm running CT headers, intake and exhaust.

 

all city i get no less than 250 a tank... on the highway ive gotten 400 on the tank maxed out passengers, bunch of luggage, and cruising to 90 a couple times with an average speed of 80

 

YOu might want to install an AEM intake kit to compliment your exhaust. I have the comptech cat back with the AEM intake and i get about 30 mpg.

 

I've never gotten any less than 320 out of a full tank, even when driving hard in the twisties all day long.