Actually, this is not true. Not unless the air filter is pretty much
blocked. Electronic diagnostics is a simple search for trouble codes.

The only thing that they could come with was driving style.

You may want to invest in a tune-up, too. Maybe have them check the
brakes, while they're got the car on the lift. Even with just 14K
miles, you may be well served by having a technician give the car a
thorough mechanical check.

In 6-02 I saw a new Civic vtec 1.6 litre with very short * : a waste of
vtec ( no way is torque / mpg esp @ high rpm maximised ).
www.turborick.com/gsxr1127/gasoline.html para 10.2(1) indicates
how bad a civic's * is.  Many car makers ( incl Nissan in Sunny 130Y
, Hyundai in Sonata 2.4, Proton in Waja 1.8 ) save on *, because 99.9
% buyers have no chance to test drive on highways, or know /
experienced a difference between short & long branch *.
Honda fits only short branch ( 4 into 1 pipe ), cheap & heavy cast
iron * for its engines <2.2 litre
www.hondaautomotiveparts.com/auto/jsp/mws/catimgs/13sm40_d08.gif
, even a F22A's *'s twin pipes are short.
www.autozone.com/images/cds/gif/large/0900823d800cf8b3.gif
Results are [i] lower though adequate torque @ low rpm ( as during
buyers' test drives ), but very low ( <½ as much ) torque & mpg @
high ( >3000 ) rpm : inadequacy increases with rpm.  [ii] on highway
when >3000 rpm is needed, user cannot change gear from neutral to
drive w-o a jerk ; crank shaft etc. cannot spin fast enough from idle to

cars have long branch *. http://circletrack.com/techarticles/73598
My local-made 4-2-1 * [i] uses aluminised mild steel  [ii] is 13 kg
< original *  [iii] has longer twin pipes than a F22A's *  [iv] twin
pipes' interiors' total cross section area is 60% > original * ( single
pipe )'s.

Many ways to chk car / engine's efficiency, e.g. chk compression.
www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/0c/f3/e5
/0900823d800cf3e5.jsp