Can you get 30+ MPG going 70-75mph?

[Synack]

Originally Posted by nalc

127mpg in the twins

ah I got cars confused, my 370 went 99.9 and the FR-S does 127.

[nalc]

Originally Posted by Synack

ah I got cars confused, my 370 went 99.9 and the FR-S does 127.

That's because the FA20 is 27% more efficient than the VQ37VHR

[Synack]

Originally Posted by nalc

That's because the FA20 is 27% more efficient than the VQ37VHR

27.0270270270270270270270270270% if you wanna get technical

[strat61caster]

Yes, easy. I regularly do a 100+ mile trip that's 90% freeway, cruise control between 70-75 as traffic allows. When I was calculating by hand 30-32 mpg was normal (it isn't a flat trip, several hills), I've been lazy so I just check the computer which says 32-34, pretty much the same given it's optimistic nature.

Check your tire pressures and look up if Texas has a 'winter blend' of gas, that might be the trick.

[mav1178]

Originally Posted by brillo

Just curious who can get 30+ MPG legitimately (manual calculation - not the trip computer) doing 70-75 MPH on the highway in a M/T FR-S or BRZ.

I was able to do it early on but for some reason lately I seem to have trouble getting to the 30mpg number. Given the size of the engine and light weight nature of the car, I would think this would be rather easily achievable.

I averaged 30-35MPG on a 1800-mile roadtrip to/from Jackson WY last September. Averaged 70-85 (UT speed limit is 80!)

A few things to keep in mind:

- Check tire pressure. If you're down to 30 or lower, you could lose upwards of 10%
- Winter blend gas: since you're in Houston, your smog problems are just as bad as in LA. The winter blend here has put a noticeable dent in my fuel consumption.

-alex

[Propaganda]

On my trips between NJ and VA every few months (500) miles one way), I routinely get between 35-40mpg. I just set it to cruise. When I used to travel between PA and VA (a little over 400 miles), I was able to make it on one tank, and still had 1.5 to 2 gallons to spare

I've gotten the same numbers with 225 hankook rs-3s (extreme summer tires), the stock tires, another set of all seasons, and 215 snow tires.

[frs10]

got around 320 miles with about 1/8 of a tank left

[Tromatic]

I have yet to see 26 MPG anywhere.

[calmtigers]

With those with 18s or wide wheels have you noticed a large drop in MPG?

[mav1178]

Originally Posted by calmtigers

With those with 18s or wide wheels have you noticed a large drop in MPG?

Depends on the tires... my 245/255 Toyo T1 Sport made my overall gas mileage take a 5-10% hit.

http://www.fuelly.com/driver/mav1178/brz/fuelchart

(Wheels were put on the car in late November)

-alex

[1086]

I am not sure if you would count this but on a recent trip I had - taking I-5 from L.A to San Jose. I averaged about 80/85 mph and was able to achieve 85-90 miles per quarter tank - I was using 91 octane and I-5 is mostly flat for the most part - hopefully that puts things in perspective?

Also note that the entire tank is 13.2 gallons - I am not sure if the reserve tank is 3 gallons or 2, but from what I have experienced it must be about 3 gallons, which means that the tank size before the 'E' light turns on would be roughly 10.2 gallons.

[civicdrivr]

I'm lucky to get 300 miles on 11.5-12 gallons. Most of the time the light comes on at ~275 miles.

The absolutely best I get was 32mpg - once, and that was when the car was new.

[Vincenttam]

It's possible, i can get it to around 30-35 going 75mph at around 3.3k rpm. But this is usually due to the highway either being perfectly flat or a bit downhill. When it's a bit tilted upward I'll be looking at 26-28 to try to stay at 75. I usually just let it drop to 65 or so to keep my mpg up.

[rice_classic]

I don't know what it is about this car but the MPG hit I take when changing from 70 to 75mph is like 4mpg. At 70mph without cruise on I can get 34mpg. At 75 I get 30 or 31.