Ok, I did a quick search, could not find any threads, If one exists, please merge this post, if not, here we go! S-types ONLY.
Format - Lets keep it simple:
Comment, if needed.
Engine size-
Hwy-
City-
__________________
My mileage- (new car-pending a road trip) City seems low and I am going off the computer readout numbers...
4.2L
Hwy-25.5
City-14 mpg

 

I'll throw my 2 cents in.

4.2L Supercharged

Anything special done to increase mileage: Not really, just kept car clean and waxed; made sure tires were inflated to 40 psi. Freer-flowing exhaust is good for maybe 1 mpg (maybe).

Hwy - regularly attain 26-30 mpg on mostly flat terrain per computer. Have an upcoming road trip where I will reset the trip computer and see what I can get.

City - no ideal as I am usually looking out for traffic and other cars + accelerating more than any other time. My best guess would be 12 mpg, +/- 3 mpg.

Avg - This is a stat I pay more attention to, as it doesn't vary as considerably. When the Jag was my daily driver, the best I had was 22.1 mpg avg., while the worst was 17.8 mpg avg. on winter blend gas (plus more time devoted to warming up). Now that the car is not my DD, I've been averaging 18.0 (winter) to 19.5 (as of last fill-up). Of course it doesn't help that I installed a new exhaust that makes smashing the go pedal that much funner. However, 19.5 mpg avg. for a 400hp super-saloon is pretty darn good in my book.

 

2000 Jaguar S Type - 4.0 V8

City - Bet 15 - 18 mpg
Highway - Best average I have attained - 27.6 mpg

 

2003 3.0S (V6)

Highway 26-29 mpg on summer blend gas
Suburban loop overall 21.5
Pure City: 18.5

In winter season

Highway: 25-28 mpg
Suburban loop 20.0
City: 17.0

All by computer. Highway travel speeds 70-80 mph. Short bursts to 90+.

 

4.2L S/C
26-28 HWY
14-17 CITY
19-21 MIX

I've always used 91 octane, average speed usually high 30s.

 

I got 32 miles/g on a trip from San Antonio to Austin.

In City usually it gives me about 15-17 miles.

 

4.2L Supercharged

Ave according to the dash meter is 18.8 mpg. I was hoping it would get better once I got tired of the feeling of "thrust", but I doubt it.

 

2005 3.0 V6 approaching 71,000 miles....

My wife approaches 33 mpg on the interstates during her solo trips to Tampa and back. That's loaded with luggage, HVAC set at 70 degrees year-round, cruise control set at 72 to 74 mph depending on where she is. I don't use cruise control. Best I've been able to do is about 29 mpg. I calculate mpg the old-fashioned way, noting the odometer mileage on the gas receipt showing the gallons pumped into the tank. Same thing at next fill-up. Then I use a calculator to figure the mpg....

City mpg? I would guess 21 or 22 tops....

Either way, I am extremely happy with the fuel economy of our S-Type. I would never have believed the Jaguar salespeople if they had told me the car could do more than 30 mpg on the highway. I didn't believe it myself the first time my wife did her Tampa trip with the S-Type. When she did it again on her next trip, and then again on her next one, I was convinced....

 

2003 s type r
i get
city 20pg+-1 regularly ( i drive 90% city mostly)
highway 28mpg+-1
mixed 23mpg+-2

highest 32mpg(filled up , set trip to zero , and stayed on highway for almost
100miles and avg consumption remained same till i hit exit and
entered city)

avg speed is arnd 30 for city

 

2005 3.0 V6

City mpg - 20-22

Highway 35mpg@60 mph, 32 mpg@75 mph.

Mixed is around 24 mpg depending on traffic.

By the way, these figures are 5-8 mpg better than my Audi due to the AWD. The Jag feels like it's a lot lighter and more nimble than the Audi even though they're about the same size.

 

2003 STR 4.2 S/C
36,500 miles
93 Octane
Usually about 17mpg in suburban mix (City-ish driving) to and from work - 2 lane roads, a few short full throttle areas.
Highway: 24-26 mpg last few trips at 75-85mph typical speed. Will be driving 250 miles today, almost all highway, probably come in around 25mpg if I can keep my foot out of it. Not likely.

 

Jon,

I usually use the cruise control since the VA, MD, DE and NJ troopers are pretty zealous when it comes to nabbing speeders. I dial it up to 7 mph over the posted limit and stay in the right lane.

Mike

 

I understand, Mike. I just don't like cruise control. Never have, never will....

 

My in city computer calculated mileage says 13.8mpg.

Based on everyones input to date (TY all), I am not getting very good mileage. Premium gas, etc, seems to running fine...

Any suggestions?

 

Get out on the highway, set the cruise control, reset the trip computers and let us know what you're getting then.

Should be in the high 20s, low 30s with US-sized gallons.

 

Move to Montana. My wife gets about 15 mpg when she drives because she just does the local stop and go routine. As mentioned earlier, get out on the open road where traffic isn't an issue and get some readings. In urban areas like DC traffic can really affect mpg readings.

 

Have only had the car for two months now but pretty much always drive it like a grandpa. Anyways, here's what we're looking for...

Engine: 4.2L Supercharged
Hwy: ~22
City: ~16 (+/- 2mpg)

 

Update: 22.3 mpg Pittsburgh to D.C. via I-79 to I-68 to I-70/270. Average speed: 67 mph - both figures per onboard display. Lots of hills/mountains to climb, rain causing lots of brake checking amongst the herd so downhill runs were not efficient.

And...the skinny pedal got abused (mostly in West VA - very open roads, as opposed to MD, where traffic was thicker and the highway patrol more evident). I couldn't help it, I'm weak...I'm going to try for 25mpg for the trip back. It won't happen but it's good to set goals.

 

All about the same for me. Curious though what you meant by summer blend gas. Is their a difference?

Whenever I hear or read something like this I think of the large manufacturer that makes the 20 different brands of whatever and after running their machines to fill the boxes or holders of one of the brands, stops the machines and tells the foreman of the line to load up the boxes of the next brand and start filling with the same stuff. Believe me, it happens.

 

It's a fact that there's a variation in blends according to the seasons- all depending on the demands of the climate where a person lives. The difference is in the volatility or vapour pressure (measured as Reid Vapour pressure) as it affects the ability to resist vapour lock on hot summer days (not a big factor on EFI engines) or the ease of starting in the worst of winter conditions when the engine is well and truly cold soaked.

I've never noticed variations in fuel consumption between winter and summer gas that was due to the blend itself. The huge reduction in winter mileage is primarily due to cold start and warm up periods when the engine is running 'rich'.

Might be an interesting experiment though.