How's your MPG?
 

I finally ran out my first tank over the weekend, and while the dash was saying 14.6 avg, I hand calculated it to be 19.1. I've been pretty easy on it so far as well....haven't taken it over 4000-4200 rpm, and this has been mostly city driving, but some mix. I'm thinking 19 is pretty good for the first tank...I know it will get better over time too, as it learns driving strategy, etc.

On the fuel subject...was also wondering what grade you guys are running and if you can tell a difference. This being the first tank that the dealer filled, I'm pretty sure it was probably just 87.

They 93 and get more mpg out of it. Nit sure of the price/milage break down. Ours averaged 22-23 on te dash . Toll way and 380 back and forth from Denton to Allen .

Not sure what the algorithms look like on these cars for the inboard MPG calcs, but I'm pretty sure it can't be THAT much difference between the two. The only thing I can figure that would cause that would be resetting the onboard MPG without resetting the trip od.

Also, to truely break in these cars, you need to beat them into the ground for at least the first 1000 miles. Big discussion about the break-in procedures for modern cars. Days of being light are over. Vary the RPMs as much as possible, and give it some short spurts of spirited driving to help the ring seat better.

Back on topic, I have been through 5 fillups since I bought the car. 1 via dealer (87) and 4 myself (3-93 & 1-91 in OK). I have seen anywhere from 14.7 (14.5 in-dash) up to 21 (20.5 in-dash) on a full tank. As far as highest period on the in-dash readout, I've seen 23.6 on a stretch of highway driving @ 70 this past weekend.

Fixed it for ya sir. I've gotten as much as 27mpg btw. :)

LMAO, then I might be screwed because I have yet to really open my car up and I've got 3k miles on it.

That's just coming from 98% of the guys on SVTP. Many threads and discussions about breaking them in. They say that if you are light on the motor now, it won't really like it when you beat it later down the road. Where as, the earlier and more often you beat it, the more it will thank you later.

^That's sig worthy right there. :lol:

How would anyone know that for a fact before anyone has had a chance to put high miles on one to come to that conclusion? lol.

:confused: honestly, IDK.

But i still beat my car regardless. It's just too much fun!

With my tune driving 60mph i get 28+ mpg and 25+mpg going 80. Tunes give better gas mileage for some reason

Because the Ford tune is more of a conservative, generic vehicle tune, I'm sure. I know Shaun at AED garuantees a min. of 3 MPG increase over stock under 2k RPM. I haven't really seen the true hwy MPG on my car yet, but hoping to this weekend. Might take it out for a nice little drive.

My commute to work (8 miles is all stop and go below 45) nets me about 15mpg.... once I get on the highway it jumps up closer to 24 or so... Big swing between city and highway!

(insert sarcastic quote about sports cars and mpg) but seriously...whats mpg?

SPM or GPG

Smiles per mile or Grins per gallon

I get a solid 22-23 out of mine, with the GH tune running 93. And I agree on the break in deal. I had the VMP tune on mine and had her at the track on the 3rd or 4th day.

I haven't really been worried about hurting it or anything...hell if that happens this early on they'll damn sure fix it under warranty! I think more-so to me it's just that its a brand new car and I like to really get the feel for things, maybe run a tank or 2 through it before I go trying out the track apps and/or showing up at Northstar with a paper tag on it! :)

I know it's different than talking a new car, but I've been building engines for many years now, and I've always done the same thing with all of them....initial ring seat and break-in the cam at 3000-3500, cool it, then heat cycle it a couple more times...up to op temp at varied RPM...cool it again, change oil and filter, take a read on the plugs, and pretty much let it rip! I've never had one prematurely come apart by this method....I doubt these new ones are really any different when it comes down to it.

Speaking of MPG....my 911 did really well, clocked upper 20's pretty much all the time. The last tank I ran through it (93 octane of course), showed 26 on the dash, hand calculated just over 25....and that tank included a night at Northstar with several 1/8th mile passes. :D

Well after hearing that, what do I know. Haha.

I'm thinking plenty....bc you essentially had the same suggestion....drive it hard from the get-go! ;)

I waited about 1200 miles before dogging it, and took it to the track at 2400 miles where it went 7.9. I don't think it matters for shit, but personally I prefer to let the cam, crank, and rod bearings establish a wear pattern before taking it to 7k. Ring seal is only an issue on cars that wash them out (carbed, usually) or if you let it get hot causing the rings to lose tension. That's my experience, yours may vary.

Anyway, I average 17.5 to 19 on any given tank. I have gotten as low as 14 and as high as 27.8 coming back from Austin with a crazy tail wind. Highway mpg is usually around 23. That's with 3.73s and 28" tall tires.

Jason, I've never heard of that great a disparity between the dash mpg reading and calculated mpg. It's usually 1-2mpg off at worst.

I have a mech friend at Bob Thomas Ford that works only on performance issues and warranty issues. He said ford sent out to all ford dealers service heads that it is better for the car to get driven hard from day one. Reason being they spent a lot of time and testing it in racing and extreme everything to do with what ever you can throw at it and found it to be really bulletproof. Plus they tuned the car down with the computer tune cause this motor is very powerful for what it is.

Just what I was told.

I've gone thru about 6 tanks of gas so far and I seem to average around 15mpg. 75% city/25% highway. Just crossed 1,400 miles on the odo yesterday. If I reset the mpg calculator while on the highway, I can get it to hover around 22-23 doing 80mph with the A/C on. I also have the 3.73 gears.

Oh and I only run premium.

FWIW, if anyone would like a copy of the spredsheet I put together to keep track of MPGs, just let me know. I'd be more than happy to send you a copy.

Yeah Danny, I'm not paying much attention to that first one, honestly. Not sure what was up with it, but I'm about to need fuel again today or tomorrow, so we'll see how it pairs up this time.

17.5 - 19 seems to be pretty good, and honestly about what I was hoping for. I'm guessing yours is still basically stock and untuned, right? I'd imagine those 28" tires help offset the 3.73's a little as well.

Speaking of (off topic for everyone with 3.73's)....I seem to notice something, not sure what, right at 70 MPH...it's very faint, just a little NVH coming from somewhere....not sure if its the gears, or maybe very slightly something with the driveshaft (balance), or maybe it's just the engine note at that particular speed/RPM....just not an entirely smooth spot. I'm wondering if anyone else has noticed something similar?

I'm overly sensitive to stuff like that...probably leading back to my days in the dealership when I did NVH stuff a lot. It's probably nothing, And I'm probably also just used to the 911, which was extremely (maybe even abnormally) smooth all the way up and past the 3-digit mark.

Just took off my muffler deletes and put GT500's on and it went up 26mpg hwy, 22mpg city avg 23.4. Tuned

^im interested in your muffler deletes when I get mine in...

What type of city speeds do you typically drive? And are that spaced out lights?

Sorry bro sold them to a dude on SVT, didnt think anyone here would want them, they droned like a mofo

I drive I35 from carrollton to duncanville everyday 33 highway miles, then about 5 city so a total of 38 miles one way 90/10 HWY/CTY
Hwy speeds 75, city 40 ish, not too many lights

damnit! its cool im just gonna hate the stock exhaust lol

Theres a guy on svt talking about how he drilled some holes in his stock mufflers for a delete sound, if anyone wants to try it you can have mine

I have mine available as well, if someone wants them to try.

His idea actually doesn't sound that bad, but not really my cup of tea.

Shoot, that's nothing then. Haha

Haha, it's not THAT bad to have a quiet car, but I must admit I do miss having a lil bit of a rumble. I've even been considering doing an O/R H with some GT500's, but that means I'll have to get a tune as well.

100% city driving I get ~15. With a canned SCT 93 "performance" tune.

damn I get like 12MPG

I know I'll be getting better mpg on monday since I'm switching back to the stock 3.31's.

That didn't last long lol

I really like the 3.31s. Ive had 3.73s and 4.10s several times and i like these the most. I think it will be awesome once the blower goes on. A real managable gear with boost on the street.

Yeah tried the nitrous in 2nd and 3rd gear and yeah.........just not going to work.

Second tank hand calculated 17.5, dash said 17.2 avg.

That's more like it. Lol. Sounds like someone at the dealer reset the readout or something.