Ideas on better MPG for my XJ6 ?
 

Hello guys...
Im wanting to try and improve the Gas mileage on my 1997 XJ6 V.P. Long body... She has new tires, Bosch plugs, K@N air filter, with mobile 1 full synthetic 10w 30...she runs great and sounds beautiful with no trouble codes.

Any ideas or tips to try? just trying to make her the best she can run on the highway? Not concerned with city driving?
Tks Jake

What fuel economy are you getting now?

This will help:

https://www.jaguarforums.com/forum/x...engines-66536/

Cheers
DD

about 22mpg on the highway of texas and 18 around town... tks doug

That was a very interesting bracket for the sensor... but a little above me at this point? Was looking for any other options....maybe something I could feel more comfortable doing or trying on a weekend?

You're getting above avg city mileage and almost optimal hwy mileage. Make the cps adjustment discussed in the link Doug provided and you may be able to wrestle another mpg or 2. But that's pretty much it for these near 4000 lb beasts.

tks bro...just trying to fish and see..... this is my first jag and just trying to see what i can squeeze out of her...lol

I flushed the throttle body out with a can of B-12 and did add full synthetic rear end oil also? it seemed to help in my Corvette..

Jake they really don't get much easier than swapping in an Andy bracket. About 15 minutes, max.


I agree with Suede, you are getting optimal mileage.

Yup, even less than 15 minutes, here's the video I've recorded with potato:

So, I am a metric boy and this MPG business really confuses me. So am I right in thinking there are 2 different versions of MPG depending on which country you come from? US vs UK ?? So on my Singapore import car when I switch to MPG, which one am I getting? Why have two different measures with exactly the same label? Metric really is so much more straightforward!!!!

Which side is your steering wheel on? Right? If so, then you have the proper MPG showing up on your dash (most likely). If on the left, then there's a big chance you might have the dodgy US MPG :P

Steering wheel on the right. I am showing approx 19 around town and 29 on open road - does that sound right?

It gets worse in the UK!

The Imperial Gallon was removed from the list of legally defined units of measure catalogued in European Directive 80/181/EEC for trading and official purposes, with effect from 31 December 1994.

We still talk of MPG but have purchased fuel in Litres since 1994!

Graham

So there is the easy way and then there is the English way, is what you are saying? :-)

Pretty much, yes :) But still, most of the cars sold in UK will show you both MPG and L/100km. And yes, looks like you have the proper MPG on yours, zathras! Mine shows between 17 and 19 around the town, and at least 30 on the long run, although I did manage to get nearly 38mpg out of it, which is a sort of success with that heavy ass :)

19 & 29mpg translates to 16 & 24mpg in the US system, which is spot on. There will be slight regional variations in mileage due to different gasoline formulations. Oxygenated & ethanol blends return worse mileage.

I ran 3k miles I get average 20mpg USA

Streets 8-15mpg
Highway 18-24mpg

Octane booster helps me a lot

I use to get 15mpg average. Now its 20

My ass is heavy enough before I get in the car! :0)

Good to know, I couldn't figure out why my MPG figure looked so much better than the figures posted on the forum and then I realised they were using a different MPG to me.

Cheers

Chris

Thanks. To my knowledge we don't have ethanol blend here, and I was always told that because New Zealand is such a small country all the fuel comes from the same place regardless of which company you buy it from. But that might be different nowadays. I do know it's frightfully expensive, on my previous Toyota I ran low octane to save money, might have contributed to the engine expiring.... Our premium fuel is about the equivalent of US$7 a gallon, from my calculations, so of course I avoided it at all costs, can't do that now :-(

Cheers

Chris

Yep, you guys are lucky you don't have to deal with a GIANT Agribusiness lobby which forces corn fed ethanol into your tanks. Marsden Point in Whangarei is indeed the only refinery in New Zealand. We did a sail by when I was sailing through New Zealand. I would have never thought an oil refinery could be a scenic destination, but that's gotta be the prettiest industrial complex to be found.:icon_woot: