26.5 mpg wtf

[Muaddib]

100% city and i am getting 22-23mpg.

[Packofcrows]

Originally Posted by RichardsFRS

What would cause this car to average 26.5. That's pretty low I would think. This was around 80mph average speed on the freeway. Far as u know it has no mods

Want 30+? Drive around 60mph or keep under 3k rpm. Keep all shifts around 2.6k and speed up slow, lower car interior weight (i.e. lose weight)

If you bought this car for mpg, may I recommend a trade in for a Yaris?

BTW, elevation also matters. I drive 68mph in cruise control. I get 28.6 mpg avg with some city driving. My elevation is about 48ft above sea level. Without city driving I range 30-32. I can totally see higher rpm=less mpg.

Originally Posted by fumanchu1

I get more smoke per mile than miles per gallons, being Sc'd I don't count but let's just say you guys with your 18-20 mpg in the high rev have it good, I start led footing and bye bye mpg's

I took my car to track and got from 9mpg to like 19mpg hahah I can imagine you!~

[shiumai]

17 to 18 mpg city. Now 15.5 soopahcharged

[DJCarbine]

24mpg city/highway, highway only gets closer to 28-29 if I can control myself


Hint : I can't

[chaoskaze]

Good thing to know everyone 's mpg is so low. LOL... I was wondering if my cat is getting clogged since my avg mpg dropped to like 24.

After all I made the 1200+ mile trip to seattle in 3 tank of gas only 5 months ago.

[Dadhawk]

Originally Posted by Packofcrows

Want 30+? Drive around 60mph or keep under 3k rpm. Keep all shifts around 2.6k and speed up slow, lower car interior weight (i.e. lose weight)

This hasn't been my experience. I have (eventually) posted every tank since new(May 2012) in my Owner's Journal thread. During that time I've made 14 trips where the entire full measurement was at a speed of 70MPH or greater. Of those my lowest mileage was 31 and the highest was a little below 36. This was based on calculated speed (distance/time). The lower ones included some stop and go traffic in the process usually followed by exceeding the speed limit more than normal. At least one of them includes periods of speeds between 90 and 100 for about 30 minutes.

[akiranakayama]

Originally Posted by RichardsFRS

What would cause this car to average 26.5. That's pretty low I would think. This was around 80mph average speed on the freeway. Far as u know it has no mods

Umm... you're cruising at 80mph. Atmosphere is pretty hard to push through at that speed. Deez ain't no Prius drag coefficients we be dealing wit herre.

[Lelantas]

Originally Posted by Dadhawk

This hasn't been my experience. I have (eventually) posted every tank since new(May 2012) in my Owner's Journal thread. During that time I've made 14 trips where the entire full measurement was at a speed of 70MPH or greater. Of those my lowest mileage was 31 and the highest was a little below 36. This was based on calculated speed (distance/time). The lower ones included some stop and go traffic in the process usually followed by exceeding the speed limit more than normal. At least one of them includes periods of speeds between 90 and 100 for about 30 minutes.

Although, something to keep in mind is that with automatic transmission, your highway cruising RPM in 6th gear is a fair bit lower than with manual, so it's not surprising that you see a bit better highway mileage than most people are getting.

I've only calculated my mileage manually two or three times, but the car MPG display shows an average of between 30 and 31 MPG with a mix of city and highway driving. Car is stock, manual transmission.

With MT, I've noticed that any speed past about 72-74 MPH and you're going to start taking fairly significant MPG hits.

[Dadhawk]

Originally Posted by Lelantas

Although, something to keep in mind is that with automatic transmission, your highway cruising RPM in 6th gear is a fair bit lower than with manual, so it's not surprising that you see a bit better highway mileage than most people are getting.

I've only calculated my mileage manually two or three times, but the car MPG display shows an average of between 30 and 31 MPG with a mix of city and highway driving. Car is stock, manual transmission.

With MT, I've noticed that any speed past about 72-74 MPH and you're going to start taking fairly significant MPG hits.

Yea, I should have noted I had the Auto, and actually meant to in the post above. All you say is correct.


Over 74,219 lifetime miles I've averaged 32.7MPG which includes a lot of tom-foolery during commuting (I race nearly everyone away from the lights and rarely see an off-ramp I don't take twice as fast as I should). That said, even with commuting 40 miles each way to work I spend a lot of time on cruise at 45 to 65MPH.

[Stang70Fastback]

I've tracked every fill-up I've EVER done since I bought the car. That means I've got 14 months of data spanning 24,400 miles, and 912.17 gallons of gas (costing $3,004.11) to draw from. Here's my information:

Avg MPG: 26.846
Min MPG: 18.324 (that was snow-storm shenanigans)
Max MPG: 33.979 (highway road trip)

Avg gal/fillup: 9.21
Avg mi/fillup: 246.8

I've noticed that the in-vehicle average readout is consistently 1.5 MPG HIGHER than what I am actually getting.

I live in Chicago. So my average will be lower than many because a lot of my time is spent in heavy traffic, or on streets with low speed limits and lots of traffic lights. When I'm driving on the highway, I tend to do somewhere between 70-80 MPH unless the speed limits are lower.

I have a 2015 Series.Blue, which is important to note because the underbody aero trays are good for a Cd of 0.27, as opposed to 0.28 for a limited (with the wing) or 0.29 for a wingless Toyobaru. This means I theoretically get slightly better highway mileage than most.

This driving was split between the OEM Michelin Primacy HP "low rolling resistance" tires during the warm months (mounted on the stock STi wheels, which weigh 18.4 lb, or ~2 lb less than the normal wheels), and General Altimax Arctic winter tires (205/55R16) mounted on very heavy steelies in the winter months.

I rarely spend much time above 4K RPM. I tend to shift between 3-4K.

One thing I did notice on my most recent road trip (which was on the winter tires) was that when the temperature was in the 30-50 degree range, I was only managing 29 MPG on the highway, whereas the second half of my trip occurred in 60-65 degree weather, and I got 33 MPG. A pretty big difference that one might attribute to the colder, denser air putting up more of a fight against a 78 MPH moving object.

Hope this info is interesting to some

[Bonburner]

so either i started driving different after the 20k mile mark or something else ..
I used to average 28 mpg ... now im averaging 23 mpg ...
im hoping its the ignition coils/batteries going bad lol

[Packofcrows]

Originally Posted by Dadhawk

This hasn't been my experience. I have (eventually) posted every tank since new(May 2012) in my Owner's Journal thread. During that time I've made 14 trips where the entire full measurement was at a speed of 70MPH or greater. Of those my lowest mileage was 31 and the highest was a little below 36. This was based on calculated speed (distance/time). The lower ones included some stop and go traffic in the process usually followed by exceeding the speed limit more than normal. At least one of them includes periods of speeds between 90 and 100 for about 30 minutes.

what has elevation been? weight? fuel type (91 only in CA doesnt give as much mpg as 93, the recommended one) how often stops? Weather/temp? etc..

[Gaiakai]

I average 26-28mpg with 30% city and 70% highway. But I work in the LA area where highway driving is pretty much city.

[Mim]

My worst recorded was 16.36mpg / 14.38L for my stock auto. Mostly city driving.

See sig for history along with mods and their effect.