Cool story about some mods which supposedly allows this guy to get 36 Mpg out of his XJS. Incredible if its true. Link to stories below.

Green Car Reports: 36-MPG Jaguar XJ-S: Hypermiling Owner's Great Lengths For 1984 Luxury Coupe.

http://www.theregister.co.uk/2014/10/19/crawling_from_the_wreckage_essay_making_cars_more_ fuel_efficient/?page=1

http://google.com/newsstand/s/CBIw8vuhwR8

 

First url doesn't work

Guy is in the UK, so that is imperial MPG. personally I think changing the wiring harness out and all that is an extreme length to get better mpg.

A straight six with a 5 speed with 500 pounds shed, after having to change the entire wiring harness out to get 29mpg us??

Not worth it to me. If you put a 6 speed and change the rear end in a STOCK 5.3 I am willing to bet you could get that highway. Around town the v12 has enough torque to driving pretty low in gears too. If I can get 19 out of it if I try with this stupid 3 speed I bet I can get 25mpg all day without trying with a 6 speed

 

I also read this, but if I did this all, I could never retrieve the cost from fuel savings lol

 

Going from copper wire to aluminum may have shaved LBS, but I would not trust aluminum wire. It was once tried as a cheaper alternative in the US and you have to use a heavier gage wire to carry the same load as copper, if you don't it will fizzle and fry

 

I just don't really get going to those kind of lengths to save such a small amount of money. He lives in the UK too. Spend some money on a little diesel or an old morris for gas and drive the XJS for fun

 

Anybody with an XJS actually considers MPG outside of a road trip and whether or not they can make it to the next petrol station?

Really?

Fill it up and stomp the throttle through the floor.

 

I tend to agree...but there are many ways to enjoy the car hobby and not all of them will make sense to everyone

Cheers
DD

 

yes this car gets 45-50mpg US gal. BUT it aint no XJS. hehe.

 

Interesting article to say the least.

 

Here's the working link:


Want a more fuel efficient car? Then redesign it ? here's how ? The Register