First week with the car and from full to the green bar before the large red strip on the gas gauge I got 331 miles out of that , my dad paid for the first fill up on it and he put 89 not listening to me , that was with city and hwy miles
26 mpg on 89 octane
I just paid 52$ to fill on 93 so hopefully the fuel Eco should be better now
This car isn't as thirsty as the ads online say

 

Im using 93oct in my 04 XF & getting 28mpg, mainly highway and of course some country road goof'n off miles... But I usually drive like a "old timer" GO AROUND!!! ;(

 

I've always gotten 22-25 mpg in my SRT. Once when I kept my foot out of the throttle on a long drive, I got just under 28.

But then SSB metallic is always smooth like dat ;-)

 

You showed great restraint.

 

Well, hopefully, I can find an issue with plug wires or coil pack because that will not only gain some mpg's but will, most likely, gain some power too

 

Just got $74.40 worth of free gas......BP credit card $3.67/gal price reduction on 20 gallons. Final cost 22.9 cents/gallon for BP 91 octane.

Ran Fred to 374.8 miles on the trip meter....low fuel light came on at the 335 mile mark.....
Was able to put 15.1 gallons into Fred then 4.9 gallons into a 5 gallon can.

So, 374.8/15.1 = 24.82 mpg. Much spirited driving in that tankful. I believe that on a long steady 70 mph trip you probably could hit 30 mpg.



A hair over 7.000 miles since the last oil change......FSS says 1,500 miles left before next oil change.....letting me go over 8,500 miles between oil changes.

I figure there was about 2.4 gallons left when the low fuel light came on....2.4 x 24.82 = 59.6 miles

 

Eh, could be better.

Screenshot_2014-04-12-16-29-35_zpswjskie9m.png

 

I only see 24 or more on the highway...20-21 in town for me...

 

I usually average 19-21 in the city and 27 or better on the highway. On our return from the dragon my last fill up was in the evening and I did not refuel until 348.7 miles later and it took just a hair over 11 gallons for an avg of 31 mpg. I run sea foam though my tank about every 3-4 months, new Plugs thanks to Chuk and I am sure we blew some of the carbon out on the Hellbender... and always watch the tire pressure.

 

I'm assuming the majority of that 348 miles was on I75 - what was your average speed ?

 

That is correct. I was following Inge and Jack Harry and since Inge was leading I would say the average speed was 78mph.

 

31 MPG at 80 MPH is OUTSTANDING !

I have found that if the spoiler is up, then MPG is down.
About 58-60 MPH is the 'sweet' spot on my roadster.

 

2005 XFire 92k...averaging 25mpg with both city, hiway driving. Only using 91-93 w/no ethanol. I'm happy.

 

sorry duplicate post.

 

Unbelievable?

 

I get 28-29mpg at 75 on a perfect flat highway, with no wind.
23-25mpg at 80mph on same conditions

I have noticed that wind speed has a dramatic effect on fuel economy.

This is all based of my dash command

**edit: this is with my spoiler down. I took the fuse out a while ago, 80lbs of downforce and 80lbs of drag is not necesary on th highway, its like carrying another person

 

Weird. I averaged 24 in town with the V6 getting on it all the time, and 30+ on the highway with cruise set at 75-85. I pulled off like 34 one time IIRC.

 

Not sure about that one. Kinda like saying the anti-roll bars are superfluous. You don't want to know too late when you needed it.

 

LOL, he could be the first ex Crossfire owner to pass through the pearly gates boasting of 40mpg.

 

Here are some gas mileage records from my receipts:
(04 XF 6 spd, 33K miles, no commuting, minimal stop and go, A/C only when needed, upshift asap, lots of 45-65 mph driving, basically granny driven)


408.1 miles 14.5 gallons 28.14 mpg


325.8 miles 10 gallons 32.58 mpg


387.9 miles 13.5 gallons 28.73 mpg


431.5 miles 14 gallons 30.82 mpg


213.2 miles 6.58 gallons 32.4 mpg


418 miles 14 gallons 29.85 mpg


403.6 miles 14 gallons 28.8 mpg


424.3 miles 14.07 gallons 30.15 mpg