The g is just not efficient, between the rear end gearing, high compression motor with high output. Unless it goes on a serious diet, it's not going to improve.
As far as turbo 4s it depends, on the car my evo x mr only gets around 240 miles on a tank.
Driving ultra slow I avg 18hwy / 12 city.
Boost eats fuel. If I get on it single digits.

 

I got a buddy always complaining about having to run premium in his BMW but spends over a $100.00 a month on smokes.

I run 93 only and get an average of about 23.5 mpg. Highway mpg is pretty good around 28.5-29.

My brother usually runs 91/93 in his 335i but did a trial run of 87 for a couple weeks. He got about 30 miles LESS out of the tank with 87 on average.

so 93 cost 3.96 and 87 cost 3.66 (.30)X16=$4.80 (atlanta prices) but got approx 30 more miles out of the fill up which equals about a little over a gallon of gas. 1.1 gallons X 3.66 = 4.02 -(4.80)difference between 87 and 93 per fill up so actual savings are $.78 per fill up. He just runs 91/93 now.

 

DO THE MATH!! Sorry for yelling, there, but the people who tout saving money are obviously bad at math.

Premium fuel is usually $.20 more a gallon.

$.20 x 15 gallons = $3

$3 x 52 weeks = $156 of saving a year. Whoopdie frickin' do.

 

So True!!!!

There are so many other areas in monthly expenses to make up the difference plus if you can afford a 40k car and 100-200 bucks extra a year is going to break the bank, you have your priorities out of whack.

 

Agreed. I did a little experement. I drove a couple of tanks very spitited and i saw as low as 13.1mpg, then I drove the next couple of tanks light footed and saw as high as 15.5mpg. I usually average around 15.1 and I drive 100% city, it sucks! On another note I took my G on a couple of trips and saw between 26.5 and 28.8mpg driving about 77mph on the highway down to Louisiana. There really isnt enough of a difference to really justify p***y footing it, so I enjoy more spirited driving more often than not. You don't buy a performance oriented car just to drive it like a Prius.

 

I have never complained about the fuel or the cost. I always put premium in both G's.
Keep in mind that not everyone lives where fuel is among the cheapest price on the planet.
The difference in regular and premium up here is over $0.60/gallon. A refill is 18 gallons and often twice a week for me. Over $1000 annually.

 

^ no kidding. In vancouver the difference between regular and premium is about 17 cents/litre. Across the border on WA, where I often fill up, the difference is usually 6 cents/litre. About 1/3 the difference. Plus, the US gas is already 25 cents/litre cheaper. Premium is canada is about $1.55/litre, across the line its $1.16. Huge difference. My US fills average 30% less than in Vancouver. So, buy 3 tanks get one free.

 

Sorry guys, wasn't thinking of other countries. I am in the People's Republic of Taxifornia. Gas is more expensive here than anywhere close by.

Why the hell can Venezuela have $1.00 a gallon gas and WE can't? Stupid government...

 

Sorry. My comment wasn't intended to get OPs thread off topic.

However, OP...what octane gas do you use? Higher octanes will give you better gas mileage.

 

yeah city isn't great but I just took my 6mt on a 120+mile roadtrip each way with a lot of driving throughout on vacation. about 350 or so miles on one tank. I feel like daily driving will never give me the same mpg as a longer trip mainly due to the way I drive. Even spending lots of time in traffic and 1st-2nd gear it hasn't been bad.

 

^I'm in Southern Cali running 91 octane btw

 

Lolz I average 12 mpg city, goes up a bit in the summer. it doesn't bother me in the least.

 

Around here, the spread is more like .40 - .50 cents/gal between regular and premium.

.45 * 15 * 52 = $351 ... Or about 96.2¢ a day over the course of a year.

 

Well according to my math the savings is much more than your calculations.
I put 171796 miles on my 06 G35 and used 7170 gallons of gas for an overall 23.908 MPG. 7170 gallons of gas at $.30 a gallon comes to a savings of $2151.00. Divide that by 7 years and the savings is $307.00 per year or about $26.00 per month. I did 48 of the 53 oil changes myself as well as air and cabin filter changes saving additional service charges.
I bring my own sandwiches to work for lunch and cut out Dunkin Donuts in the morning by making my own coffee at home in a Keurig coffee maker. I don't use their over priced K cups either.

And that is how I was able to afford a new 2012 G37S

My 2012 G37 runs fine on 87 octane as did my 06 G35

The vehicles are delivered by the dealer to the customer with a full tank of regular.

Telcoman

 

Another MPG thread is one too many when there's already a huge comprehensive one that is sticky. Another MPG thread that turns into a 87 vs 91 octane thread is insufferable. Why should this thread stay open?