I just completed a longer trip - about 250 miles to my destination, then 250 miles back home at the end of the weekend. I filled up at the start of each leg and again right at the end. The trip consisted of an hour or more of really bad traffic when in the San Francisco Bay Area, then mostly highway miles driven at 75 to 80 MPH or thereabouts. Much of the trip was on CA Highway 5, so that's a rather leisurely pace, but I definitely wasn't hypermiling. I calculated mileage by using Google Maps to measure miles driven, and the gas pump to measure the amount of fuel consumed.

Average mileage was quite a bit higher than I expected: 26.5 MPG. I'd call that a rather pleasant surprise.

 

I consistently average 16.5 to 18 in a mix of about 50/50 street and freeway driving locally. On road trips averaging about 60+ mph my mpg is about 22-24. in my NA 2012 with an etg tune and Mina exhaust.

 

The 4.2 has to use higher revs to get going hence why find the consumption quite high I've got the n/a 4.2 with oe tuning and quads

 

Traffic! Ugh! It took me 2hours and 15 min to get home from work. About an hour into it my MPG was 6.9!!!!! I ended the drive at around 13 it was not a fun drive today. I would rather the 13mpg be from throwing her in sport mode and having some fun. NJ is not a fun place. It is overcrowded. I need to move. Only good thing about NJ is our gas prices are low... Seeing as I need to fill up my tank in the morning, lol.

 

I average 17 with a mix of city highway only commute 16 miles per day. I would do allot better if I would have left fuse 19 in. It is intoxicating to hear the cat roar.

 

Did a 6000 mile trip with my XK this summer. Average speed was 60 mph. Average gas mileage was 26.5 mpg. I am running Bridgestone low rolling resistance tires, which in my experience with other cars nets about 0.5-1.0 mpg. I do monitor gas tank range on fill up. Usually, this car is driven in town almost exclusively by my wife. She averages about 18 mpg. and gets some 350 estimated per tank. On this trip the XK seemed to loosen up with miles - my estimated range kept increasing to the point where it was a bit over 500 miles. I usually drive 70-85, about over speed limit. City rush hour traffic just kills gas mileage. Stumbling through Portland rush hour reduced average gas mileage on this 6K trip by 1mpg overall.

 

Looks like MPG is all over depending on driving style and conditions. We have yet to take a nice long road trip so don't have a read on higher end of the reading.


I hear you, traffic like that does blow.

 

Rey - What engine does your XK have? 4.2 NA? 4.2 SC? 5.0NA? or 5.0 SC?