Low mpg
 

I've been doing some readings around the forums and people seem to get around 28-30 average mpg. I'm getting only 24 mpg since day 1. I've have the car for about 3 and a half months now.

How heavy is ur right foot abd when do you shift? Also do u down shift or brake to slow down..cruise control? I get 26-27 min but 28-29 most of the time. Just depends on if I take a few mtn passes or drift some corners that week.

I don't speed that much and I shift at around 3-4k. I just use brake to slow down and don't use cruise control at all.

Also this is my first manual so don't know if that factors in.

Cruise is your friend.

If you are driving from stoplight to stoplight in congested areas, 24mpg is about right.

i get about 29/30.... i neutral a lot :bellyroll but i dont really care about mpg even its my daily driver.. its all about fun in this car:burnrubber:

sports car = wtf is mpg:iono:

I get less than 23mpg but live in LA and my commute is < 3 miles one way.

This is my daily driver, and yea on the way to work its stoplight to stoplight. On the way back its all freeway 60-70 mph

Are you going by the dash indicator? It can be off. The only real way to track your fuel is to either do it yourself, or use a tracking site like fuelly.com

Should we go into a D4S discussion? I find that between 1000-3500 rpm I'll get around 20mpg, and then it will go up to ~40-50mpg when D4S port injection starts coasting in the 3500-4000 range. Anybody else want to chime in on this?

How have you been recording your MPG? You might have something off.

I've ran my car hard, like track hard, and didn't drop under 26MPG for that tank.

I'd double check your match.

http://www.fuelly.com/driver/stiex/frs

It is not that simple. Depends on a whole lot of other things, but D4S kicks in and generally uses more gas (not less) to generate even more HP with higher compression. I can get very good highway mileage too at 65-70mph while in 6th on flat highway (35+mpg). The best mpg I got was during my break-in period when I was trying to stay under 4000k.

I've been averaging 32mpg on my 90-95% mountainous highway commute. I've seen as little as 24mpg on my spirited country-side drives though, too.

I would say yes. I have been driving manual for over 15y and was very ineficient (and in a way still am getting used to this new car), also listening to loud music messes up my mpg because I'm not tuned-in to the engine revs. I find that being able to listen to the engine helps you gauge shifting timing better.

I found out that my range goes from 300km to 400km (25% increase in mpg) just by doing a long distance trip (hwy driving in 6th at around 3k)..

I have come to terms with the fact that, a) I do a lot more city driving than I want to, and b) Im really enjoying this car so I'm holding back or trying to be ultraconservative, but I am efficient in using the manual transmission tho. Can't comment on how automatic fares. One thing I am dissapointed with this car is the range, wish the tank was large enough to accommodate 500 clicks. Curious what median and avg ranges other people are getting.

I have only 2600 miles on my car and my MPG is also 24.2


"REALLY HEAVY FOOT"

Ive seen it do 25 MPG doing a consistent 125mph for about two hours.

My understanding is that the two systems work in complex synergy. There is no strict cut-off when one is working and the other isn't, except at the lowest speeds. I agree though that their is something about the system that causes the engine to have a huge differential between highway-only driving and ordinary 45-50mph back road cruising.

Try turning your efficiency indicator on which has an arrow flash on the LCD screen when you should shift for the best efficiency.

What Husker741 said. You will see the arrow around 2K. Takes away some of the fun factor but in daily commuting you can only get there as fast as the traffic will allow anyway so alot of the fun factor is gone anyway.

i'm averaging about 22 mpg - 4 miles each way, spirited drive to and from work in traffic. i do no freeway/highway driving.

If you want to see improvement you have to completely change how you drive. Here are some beginner tips:
(1) Don't be in a rush.
(2) Ease away from stop lights. Who cares if you're not the first car across the intersection?
(3) Shifting at 3-4K and you think that's good for F/E?? Try shifting at 2K.
(4) Fuel economy goes down w/ speed *over simplified* so try doing the speed limit or "just" above it if you have to. (PROTIP: police will go after the chumps going by you in the passing lane)
(5) Learn to coast to your advantage. Try and minimize the loss of speed. If you see a slow down ahead, don't fly up to it and slam on the brakes, instead COAST (or use the brakes minimally). Instead of hitting the bottle-neck and coming to a complete stop you may only lose half your speed, etc.
(6) Find a friend who is a F/E whore and ride with them. I'm sure you think you know how to "drive for F/E", but the fact you're doing so poorly tells me that you don't (not to say that you "drive" poorly).

Best of luck! F/E driving can be addicting in its own way.
C'MON BABY GIMME ANOTHER TENTH A GALLON! :)

Averaging right around 20 MPG I'd say. I like it that way. A few extra bucks a week doesn't matter.

I can understand that it uses more gas but it also has a variable timing difference at the point D4S kicks in, it seems like an efficient driving style to also let the engine breathe in some cases, as the engine and drivetrain seems to get smoother in a higher rpm range (at the cost of being really freakin loud sometimes.

Shifting below 2500 rpm usually sucks for me because I get a lot of syncro-feel and clicking in the transmission.

Thanks for all the input! And yes, I use the indicator on the car.

I got 26mpg doin 126mph for 2 hours. Got you beat.

I dont even try to drive "light footed" and still get 30 mpg. (all premium gas in my area is 93 octane 10% ethanol)

Same. In fact, I was exactly 20.0 MPG today.

I bought this car to have fun with it. I don't have fun when I drive conservatively.

haha... makes me feel better about getting less than 23mpg on average. I can't say I necessarily have a heavy foot, but I do like being the fastest car from redlight and I like to hear the engine wind up every opportunity I get (I don't get too many living in LA due to traffic). Come to think about it, maybe i do have a heavy foot... haha... totally agree... I bought this car to have fun for those small windows in my mundane day. A couple bucks won't break me.

Agreed - I bought this car to liven up my boring commutes. It does so admirably. However, it only returns 24mpg while doing so... and that's still better than the 20-ish I was getting out of my much less fun tC.

I was averaging about 23 mpg until the turbo went in. It dropped like a rock after that.

I've been doing this for the past couple weeks and went from a 27mpg average up to 32mpg. Agreed that it has a fun factor of it's own. But I also really enjoy driving this car like it's meant to be driven. So I'm going to do the F/E driving for my commutes and drive the hell out of it on the weekends!

Precisely, I was considering some hyundai shhhbox, and then said, flock it, I'm driving.. tired of going shopping with the wife too (last time I did I bought a minivan), went by myself and got what felt good at my hands.. end of story morning glory.

And like another driver said, whats a few extra bucks, I'm already not a 6 cyl platform so that in and of itself makes a big ($) difference.. I am astonished at the difference between hwy vs cty driving tho.. on the other hand, whats the point of getting a vette if youre just going to drive around the block.. there is a fine balance point in there somewhere. Also imperial MPGs vs metric MPGs here in Canada..

:laughabove:

? Why do you believe you use zero gas keeping car in gear when coasting?
You can still hear the exhaust note which indicates that the pistons are firing and they cant fire without fuel. Maybe I am wrong, IDK.

It still burns gas at the rate that the rpm needle indicates.. you're just not making the engine work so it falls below 1k..

Careful driving in neutral, you effectively lose control of the car if you're distracted and depending on conditions.. my uncle died that way going down a 30 degree incline, couldn't put it back in gear because the tractor was loaded (a few tons) and it had picked up too much speed..

I'm pretty sure that you are incorrect. Most modern F/I engines cut the injectors when left in gear and coasting. I however do not specifically know if THIS engine does or not.

It's standard for ECU's to cut fuel to the engine, it's basically free fuel savings. This has been standard practice for nearly a decade. If you are in neutral you NEED gas to keep the engine spinning and power going to the alternator, A/C, brake booster, and other accessories. If you're in gear you can use momentum to keep all these systems spinning.

You are still hearing noises because the engine is still pumping air through the system, every time a valve opens and closes there's actually a sonic boom occurring. You can feel the car go into "compressor mode" as the engine shuts off the fuel (a little lurch forward) and if you have the instantaneous mpg on you'll see it jump to 127mpg. When you hit about 1,000 rpm the fuel kicks back on to power the accessories and maintain idle, it'll lurch forward a little bit which took me awhile to figure out.

With regards to the OP the biggest factor in fuel efficiency for internal combustion engines is how it's operated. They work best at constant load and constant speed, you'll get the best mileage using cruise control, it's thermodynamics. Stop and go is death to fuel economy, accelerating costs a ton of gas and braking turns all the gas you just used into useless heat, coasting or maintaining speed is what nets you decent gas mileage.

You'll get better mileage cruising at 100 mph than you would stop and go from 0-25 and repeat.

Edit: Basic source http://en.wikipedia.org/wiki/Energy-...ing_or_gliding