High speed MPG's

[TheLorax]

What do you guys get for gas mileage when you are going 80+? I know high speed has a big impact on your gas mileage and I'm curious if what I've seen is average. I recently did a 140 mile trip in rolling hills going 85ish mph and I saw about 29-30mpg calculated at the pump.
Mods that could affect gas mileage include an intake, tune, eibach springs, and rhino racks with an inno fairing.

 

[4g63gst20]

I got 41 at 75mph for 600+ miles

 

[2014 Blue RS]

I got 41 at 75mph for 600+ miles

Wow! I average about 35mpg cruising at 75 ish

 

[oldslowchevy]

I actually believe at speeds above 70 the 1.8 actually does better then what the epa claims. I got 39 but most driving is in town and the average mileage is 27. :-(

 

[Natesriv]

85... where the f''' is that speed limit?

 

[TheLorax]

85... where the f''' is that speed limit?

South Texas

http://en.wikipedia.org/wiki/Texas_State_Highway_130

 

[TheLorax]

I got 41 at 75mph for 600+ miles

What state is that in? I'm sure terrain plays a big part in it as well.

I think my wifes 4 cylinder camry actually gets better gas mileage at speeds of 75-80 than my sonic. It's much more aerodynamic even if it is heavier and has more displacement.

 

[Hawkdsl]

Well, east cost.. they'll put you under the jail at 85+

Just crossed 1000 miles, so I'm still breaking in.. but the sweet spot so far is 63 MPH @ 37.2 mpg (93 Ot, 1.4 turbo, 6MT)

Mods intake and Exhaust, no tune

 

[Hartleracing]

800 miles
34mpg
980lbs between 4 adult males and 100lbs of gear
2012 hatch LT 1.8
Full exhaust header back, CAI, tune, coilovers and swaybars front and back. 15" wheels, 93 octane
Terrain was a lot of highway, 3/4 was around 75mph

 

[4g63gst20]

What state is that in? I'm sure terrain plays a big part in it as well.

I think my wifes 4 cylinder camry actually gets better gas mileage at speeds of 75-80 than my sonic. It's much more aerodynamic even if it is heavier and has more displacement.

it was somewhere in Kansas to Minnesota. Only stop for gas and cruise control all the time.

 

[MaD]

I averaged 32mpg @ 75 from Seattle to Spokane at pump and using Torque and 93 oct.. 2 people over the pass on I 90, used 1 1/2 tanks there and back

 

[MaD]

Also all on cruze.. forgot to add that..

 

[cdavie89]

Old post but I just did a trip to West Palm Beach which I was about 150 miles or so from me. I did between 70 to 80 MPH and on the way back I screwed around and pushed my car to the limits and got to 120 MPH. Holy crap that was fast but after filling up I got 34 MPG. My car loves long drives on the interstate [emoji39] my car doesn't like city driving but neither do I [emoji4]

Btw I have a 2015 Chevy Sonic LT 1.8


Sent from my iPhone using Tapatalk

 

[black granite sonic]

I have to agree, I have and 2015RS 1.4t, I did a trip to the Rockaway NJ Meet. It was a 2 hour ride from Newington Ct. lets just say I didn't drive slow. I was rolling around 80 most of the way. Average mpg was 35. it seems the best gas mileage is when the rpms are at 3 grand.

 

[wingnut]

My wife and I just drove from Harrisburg Pa to Savannah Ga and I was doing between 70 and 80 as traffic allowed.In the hills of Va we were getting in the low to mid 30's. Nearer the coast where it flattened out we were 39 mpg. Terrain makes a big difference.

 

[JesusTheAgnostic]

At 75 in the dry heat at the border of New Mexico and Texas, the display reads 39 - 42 on average. Actual is more like 37-39. Cruise control on, and the road is basically a kiddie roller coaster up and down but mostly flat, and never too up or too down. 1.4 LT so RPMs are at around 2100 or so, I really don't know exactly what RPM's it is definitely below 2500 though, probably 2350 at most.

 

[Camaroboi13]

No cruise control here, 421 mile round trips from my house to the academy up and over the grapevine (pretty mean hill for those that don't know) doing 80+ with several stints over 100, I was getting 34-36 on average with a best of 38.1. 1.8 LS Auto. Once the 18s went on, my average mileage dripped from 32ish to 28.5ish.

 

[2014 Blue RS]

I know that drive well. Great mileage. My RS can't touch that.

 

[mendoza_juan]

I average 22mpg with speeds ranging from rush hour traffic to the 108 I hit today on the way to work; racing the time clock

Sent from my SM-N910T using Tapatalk

 

[Z71]

2013 Sonic LT sedan, 1.8 engine,5 speed manual transmission:

My average MPG (about 60% city, 40% highway driving) is about 36 MPG. This with A/C on all the time, and using regular unleaded E10. I know how to get good mileage out of a manual transmission car. The key is to avoid jackrabbit start and accelerate at a moderate pace. The manual transmission is geared high and takes some getting used to. I had a 1992 Mazda Protégé and 1999 Mazda 626 V6, both with manual transmissions and the gearing was very aggressive compared to this Sonic. Performance was much better, but gas mileage was also much worse (27 MPG average for Protégé LX and 25 MPG average for 626 V6, and I used mid grade gas in Protégé and premium in 626). Sonic is clearly geared to be an economy car, not a performance car. Both Mazdas would run around this Sonic in circles in terms of acceleration and overall high speed response. But high manual transmission gearing in this Sonic saves a lot of fuel. I do not drive slow, usually around 75-80 MPH on an interstate and I use cruise control a lot. Once the car is at cruising speed, fuel economy is quite good. I can get close to 40 MPG cruising at 75 MPH, depending on brand of gas. Yes, this car gets different mileage with different gas brands.