Highway Mileage S 4.2 vs STR
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Highway Mileage S 4.2 vs STR
I needed to take both Jag's on a trip from Pennsylvania to Virginia last week.
We departed PA at the same time and took Rte 81 South. We met 219 miles later at a Sheetz for coffee and gas.
The STR arrived first averaging 70 miles per hour and used 9.05 gallons
24.2 MPG. The S 4.2 arrived 15 minutes later averaging 63 miles per hour. We turned North in the S and the STR continued South. Filling up the S 434 miles later in PA with 16 gallons. 27.12 MPG. average speed was 69 MPH for the entire tripin the S
Best guess...Supercharger costs about 3 MPG on the highway.
We departed PA at the same time and took Rte 81 South. We met 219 miles later at a Sheetz for coffee and gas.
The STR arrived first averaging 70 miles per hour and used 9.05 gallons
24.2 MPG. The S 4.2 arrived 15 minutes later averaging 63 miles per hour. We turned North in the S and the STR continued South. Filling up the S 434 miles later in PA with 16 gallons. 27.12 MPG. average speed was 69 MPH for the entire tripin the S
Best guess...Supercharger costs about 3 MPG on the highway.
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Both vehicles have similar Continental tires and TP of 32 PSI. Loading was about the same, I drove the STR with one passenger to VA and then returned in the S with one passenger. I did'nt romp on the gas either way, but did not try to hyper mile either, just normal highway driving with not much traffic. I tried to keep the two cars as equal as possible without being extremely experimentally accurate. I thought 3 MPG for an added 100HP Supercharger isn't too bad. (That and another $13K sticker price!) The six speed transmission really helps with the MPG clicking less than 2,000 RPM at 70 MPH
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Our S-type gets better gas mileage than our STR. Of course the S-type is a 4.0 compared to the 4.2 on the STR but the S-type averages 4-6 mpg better in all conditions.
What was interesting though was when we had the '10 XF 5.0 supercharged it got almost exactly the same mileage as our '09 XF 4.2. Both of the XF cars got substantially better gas mileage than the STR.
That new 5.0 engine is really impressive.
What was interesting though was when we had the '10 XF 5.0 supercharged it got almost exactly the same mileage as our '09 XF 4.2. Both of the XF cars got substantially better gas mileage than the STR.
That new 5.0 engine is really impressive.
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I was thinking about it but the price the place was charging was for free fills anytime they went low. I was moving so much, to pay that kinda price for free fill ups for life when I'll only live near the place for about a year so I didnt do it. They could only be filled at there location. They did have a nice program though if you were gonna live near them a while. If your tire went flat they said you would let the tire empty and then fill it with air, bring it to them whenever you can next and they would purge out all the air and refill with nitrogen, anytime as many times as you need. I have an air compressor so I check and monitor my tire pressure pretty regularly. Once I actually settle somewhere for a while I might look into it again.