Hey guys, does anyone know to get better gas milage. My 05 x get approx. between 17 to 18 mpg, highway and city. Only 33k miles

 

I've exceeded 30 mpg on a 300 mile trip on my 02 3.0 as long as I keep it below 70 mph. I usually average about 25 but I'm on the interstate a lot.

Your numbers seem really low. Could be your driving habits or could be a problem with your car.

Check your tire air presure and the likes, Take it out on a straight, flat open road and calculate it to see where you end up. This will at least eliminate your driving habits.

If its still low, look into vacuum leaks that could cause your car to run rich.

 

17-18 for city driving is normal (The EPA's rating for the 2005 car is 15 city)

If you are only getting that on the highway as well, you have an issue.

 

TOny, how much intown driving do you do? Keep in mind that the X-Type is going to pull 17ish in town and at constant speed on the highway (around 70 mph) will pull in the neighborhood of 25-28 mpg. Both of these numbers assume the car is up to temp. Take off about 2-3 mpg if the engine is not up to temp. Jaguar runs their motors really rich when they are not at temp.

Out of curiousity, when accelerating, at what RPM is the car normally shifting at? This will give me an idea of how hard you are on the gas. If you are like most of the DC drivers I have seen, your numbers are not too surprising.

 

will take my x on a long highway drive to see if better mpg.

 

swapping out the o2 sensors help......alot

 

Currently my car is showing 12 MPG but it's only city....highway I get into the 30's.

 

 

Disco stu how hard is it to change the 02 sensors on the jag I have an 04 x type 3.0 and how much would each one cost I know they are not cheap because I had a 01 vw jetta vr6 and those were easy to change.

 

What octane gas do you fill up with? If you aren't using premium your MPG would will be affected and not for the better.

 

That information is completely false. There is little difference in the BTU rating of regular vs premium gas (regular is actually higher). Premium allows the computer to advance the timing so better performance is available without danger of engine knock. Premium fuel is all about knock (and sometimes additives).

When the knock sensors on a car detect a knock the computer retards the timing to protect the engine. If no knock is detected the computer advances the timing and runs off the premium fuel timing tables, which makes the car "peppier". On higher performance engines the vehicle can be downright faster.

A car running off the low octane tables can be just as efficient IF the driver does NOT try to compensate for the lack of power and begin flooring it. In fact, I get better mileage from regular gas than premium, but I basically baby the car anyway. Let's face it, the X is not a great handing car to begin with, and those who think it is obviously haven't driven enough cars to be a good judge.

The important thing to remember is to treat the car properly when you choose to run regular gas. No flooring it or wild accelerator changes and keep your ears open for knock. If the fuel is a particularly bad grade you could get knocking even when you're already running off the low octane table. And lastly, engines can have a slight knock and the average person can't hear it.

Bottom line: Premium fuel is for performance, not mileage. People who claim that regular reduces their mpg are trying to force the engine to give the performance it can't get out of regular fuel safely. Want performance... Use premium period.

 

great info. i use premium now...and will continue to do so.....thanx

 

I swapped one and i was getting 27 mpg, highway, and 21-22 city. Its ridiclous. I didnt have to fill my car for about 17 days.

Theres four In total I believe and the sensors range from 50 to 200. If you have someone else do them its costs about 400 buck, thats how much it was for mine.

 

Yes, it is ridiculous. Please tell us where you were able to buy an X-Type Hybrid because there is no other person in the entire world who can get anywhere near 20mpg city with their gas powered X-Type. Not to mention, 17 days before fill up is an arbitrary number.

Let's start at the beginning... Did you have a bad O2 sensor? Most O2 sensor malfunctions will trigger a CEL (check engine light). Retrieving the codes with a scanner will save people lots of money over randomly swapping out parts. A bad O2 sensor will cause an engine to run richer. Replacing a good sensor will make the mechanic run away richer.

Back to your 17 days example... If you're going 17 days between fill ups, that's less than 1 gal per day, if driven daily. At 20mpg that's 10 miles out, 10 miles back. Which means your engine probably isn't up to temp for a substantial portion of your commute, so it's running rich, wasting fuel more than others who drive farther.

So, did you have a bad O2 sensor? If so, how did you know? What was your mpg before and after fix on the same commutes? How far between stop lights/signs where you normally drive?

 

C5 is right. The cost of replacing your O2's will be about $100 per sensor plus installation. Plan on $500 - $1000 for all four to have a shop to do it. Chances of them being the end-all be-all culprit at all are not very good. I believe that Disco had cat converter problems as well and it is likely that when they changed the sesors on his car they cleared the OBDII system. It takes several miles and in some cases several hundred miles for the OBD system to fully come online to a ready status after a reset. I would think it would be probable that the car might not have been seeing any problem after an initial reset thus causing the system to not try to compensate for a malufunction by richening up the fuel mixture. His fuel consumption may improve in the short term. In time it would go right back to square one. Just my theory...

 

One little gem of info hidden in the back pages of this forum discusses poor mileage as a result of too much engine oil.

Double check your engine oil level, and make sure it is not over the Maximum line!

I had mine overfilled just a bit over the line, and did indeed see a drop in my mileage. Pulling out the extra (with one of those little hand-crank gizmos from the auto-parts store) immediately resulted in the mileage going back to normal (right at 25 mpg for our '02 2.5 X-Type)

And do NOT use ethanol/gas mixtures. Cheaper to buy, but poor mileage and lost power. Also, the ethanol pulls about it's own weight in WATER into the fuel from the surrounding air, and can indeed cause (many) other problems.

 

I don't get it. Maybe I'm just lucky. 2003 2.5 manual trans. Drive it like I stole it. 70,000 trouble-free miles on the car. I typically get 23-24 mpg (U.S.) with mixed driving, and just took a 1200 mile freeway trip where I got 28mpg driving 75-80 mph. The worst I've ever recorded was 17 during the winter with 10-15 min. warmups before driving off. I actually bought this car as a fuel saver - my other vehicle is a Ford F-350 with a 6.8 v-10 that gets 11mpg no matter what you do with it. Driving around town - 11mpg. Highway trips - 11mpg. Towing 5,000 lbs - 11mpg. Strange.

 

Few things to consider in your case... First, you have the slightly more economical 2.5. If driven properly, it will give better mileage than the 3.0. Next, you have a manual trans. The typical drive train loss for an auto trans is usually between 10-15%. You also get to choose your gear and shift points better than an auto will do it on it's own. And lastly, what people consider city or combined driving is HIGHLY subjective. People think if it's not a divided highway then it must mean city. Sorry, no.

You're not lucky, you're cheating with your figures and certainly NOT driving like a bat out of hell while getting over 20mpg, or even 17mpg for that matter. Bring your car to my house and we'll see if we can stretch it's mileage as much as you can stretch the truth.

 

Arbitrarily changing oxygen sensors will yield nothing. OP, your vehicle is performing normally from the limited info you provided. I ran urban cycle in my X for a few years back and forth to work and 17mpg in the hills around here is typical (my X was a 2.5). You may be able to pump up a MPG or two by making sure tire pressures are correct, oil level is correct, filters are clean, etc, and watching your driving style.

 

I am getting 17.8 mpg in Washington DC and my avg. speed is 13mpg!

Have my x type since 2006, and it's just done 19k miles. So, it's pretty much city driving.

Simply reading the numbers off of my car display!