My average is horrible. Here in LA. I get 20mpg

 

My lifetime AVG on my 350 is 22MPG. I usually always get over 300 miles per tank. My last 4 or 5 tanks have had a 24MPG AVG. 85% highway

 

C'mon guys, we can have our fun too! :P

Honestly, I rarly go under 3/4 of a tank, as I commute less than 2 miles a day to and from work. The 35mpg I got on the way to Dallas from austin is the best realistic mileage I've managed in my 250MT.

Shui, seems like your mileage on your 250 is fantastic, btw!

Also, fun aside, let's focus on helping the OP with his question, rather than bickering about which method is most accurate... It's agreed that it varies for lots of reasons, but with a loaded car, (family, bags etc.,) a good (conservative) number for calculating fuel cost would probably be around 350 miles per tank. Many here can reach 400, but with a loaded car, some traffic... Just my thoughts.

 

driving from Philadelphia to Baltimore, i got avg. 32 mpg going ~80 mph. I have a 250 with 18" front and 19" rear wheels. def an improvement over my stock 17s when i got about 28mpg.

 

I average 20-22 MPG on my 350. I push 300 miles on a full tank of gas. I noticed ever since I put the exhaust and intake on my car the MPG has gone down.

 

Strictly highway i can average in the high 20's and if I'm very careful and go 55 - 60 tops id be in the mid 30s add some city driving then it'll plummet to the mid 20s at best !

 

People usually push their car harder when it sounds better

 

That is def true. I remember when I first bought my car with stock parts it would say approximately 335 miles when I would fill up. Now when I fill up it goes to 320 miles.

 

I got 361 miles to my tank once....the average I get is between 330 and 335...unless I put my foot in it then I am around 290 to 310. Love this little beast lolz

 

When I did 10 hours of highway driving once I got 475 miles out of a tank with my IS350. After filling it up I worked it out to about 31MPG. Could have broken 500 easily, but it would have meant dipping into the 2 gallon reserve and I wasn't entirely sure where the next gas station was.

 

Took a 500 mile trip the weekend and averaged around 24 mpg on a 350 AWD. I ran 80 mph pretty consistently.

 

I mostly drive about 65/35 city/highway and normally get around 25 mpg in my 250. Anytime Im on the highway I go 70 and hit the cruise control on.

My most recent tank I went 60 instead of 70 and got 395 miles to the tank (estimated 35 miles left) which was 29 MPG! I noticed that my RPM was right at 2K when I was going 70 and dipped down to around 1.7-1.8 when going 60. I never knew how big of a difference the lower RPMs made. Im estimated to get 450 miles on my current tank but that probably wont happen

 

Looks like the normal fuel blend has come back. Can finally pull 400 again! Don't worry about the exclamation mark... wants me to change my oil which I will do soon; did not bother to turn it off lol!

 

My average on an 2007 IS350 is like 21MPG mixed, local I get like 17-18, the best I had long distance to and from Vegas to OC was ~30MPG average going around 75mph.

 

Here are my averages on a 2007 IS350 running a catless setup w/ tanabe axleback; my commute is around 70% highway 30% local:

Car's lifetime average: 23.0 mpg
Most recent Tank average: 25 mpg
Most recent range when I filled up: 367 miles