1997 Honda Civic DX gets horible gas mileage?

[QuantumBunnii]

Hello all,

I've just recently transitioned from a 2001 Auto Kia Rio to a 1997 Honda Civic DX (also auto) under the unambiguous conviction that it got better gas mileage: virtually every website I've visited stated that it always got between 30 and 39 mpg. However, this does not seem to be the case for me. In fact, the Civic has a much bigger tank and seems to deplete to empty given the same miles. I have calculated my MPG various times, and have received an average of app. 21mpg. Is there any reason why this should be so? I know the car has cool-air intake, but I drive at max 55 mph on highways, and it doesn't seem to be the prodigious economy car it has been made out to be. At best, it seems to be on equal standings with the Kia.

Also, incidentally, I've noticed that cops pull me over a LOT more in my Civic. I actually drive much more economically-- and therefore (at least seemingly) safely-- but they seem to be glued to the conviction that if a car looks old and... civic-ish... there must be something wrong with the driver. I've never gotten pulled over *once* in my Kia within a year; within a month I've gotten pulled over 5 times with the Civic.
Has this ever happened to anybody else? I'm starting to think that keeping my Kia would have been much more 'economical', just because it appeals to the fatuous minds of cops.

[California98Civic]

It is the auto, so it will be lower than my manual. But that's too low for a DX, it seems to me. Has it been checked out by a mechanic? Do you have the skills? Compression? Sparks? Brake drag? and etc... In normal driving in the city you should get probably 25mpg on an auto. But that is just the EPA (my guess of it too).

j

[War_Wagon]

If it has a cool air intake, is there evidence that anything else has been messed with under the hood? Any aftermarket bits that may have been incorrectly installed etc. Stock size wheels and tires? Stock exhaust?

[Ryland]

EPA rating for the civic dx with the automatic is 24/32mpg, Honda's don't tend to like after market air intakes so that is going to drop it down right there, same with an over sized exhaust, so look under it to see what else has been screwed with.
It would be well worth you getting a scan gauge, not only for improving your driving style but for checking things like engine coolant temp, if it's going into closed loop and that everything else is running right.
Flushing your transmission and doing a full tune up could be worth while as well.

[PaleMelanesian]

Check the battery. Those tiny things wear out faster than some cars with bigger batteries.

Any Check Engine lights? A faulty O2 sensor could give you bad mileage and it's not uncommon for cars of this age. Some auto parts stores will scan your error codes for free.

[Hatchtastic]

I have definitely noticed increased attention from the #&^%*&# #&(^$#&*^$ @!)(*$^%* @*)%(@(hole cops in my Civic. Even when it was quiet I got more attention. #@)!@ #&@)@ !)$&* cops. But, 5 times in one month, what are you doing while driving?

My parents' 2000-ish Civic autotragic would always get mid 30's on the highway and mid 20's in town. Time for some maintenance and get rid of that cheap "cold" air intake?

[Quasimoto]

I would have a tune up done by a competent mechanic. Thats the best place to start. You should be getting mid 30's at least on the highway. I have noticed that when I'm driving under the posted speed limit, the cops have a tendency to check me out more than when I drive over it. Just suspicious I guess.

[Pendragon]

Not knowing the background or mileage of the car, you may need to perform a good bit of maintenance that has been "deferred" by the prior owner. Number one on the hit parade is a timing belt. Do you have any maintenance records showing when it was last replaced, if at all? Honda engines are interference fit engines. If the belt breaks, the odds are all too high that the pistons and valves may have a rude introduction to each other. Transmission fluid change, and perhaps brake fluid. Check all four wheels when jacked up to make sure that the brakes are not dragging. A dirty air filter can cause a surprising loss of mileage.

Do the recommended tune-up (look out for oil inside the distributor cap) and clean the induction system as well and run some seafoam or BG 44K through the gas tank for starters.

How is the alignment? If the tires show any odd signs of wear that could be a problem both in terms of tire wear and mileage.

Then keep records of your miles driven, the conditions and amount of fuel.

[Ford Man]

Possibly a bad 02 sensor. I've had them go bad and seen the mileage on my '88 Escort drop by as much as 25-30%.