Aspect

How's it going CL,

does anyone know the optimal cruising speeds for our engines in terms of fuel consumption vs speed? Over the last weekend I went on a small 4 hour road trip and I find the best spot was about 127 km/h(~80 mph) and averaged about 8.2L/100km(~28 mpg) about the same as if I was going ~118 km/h. On my city highways I stick to the latter speed as I don't want to risk being pulled over. Not asking for people to admit speeding over limits, just want to find the most efficient speeds for our engines.

Thanks

MikeFig82

iTrader: (13)

I find 70-80 MPH works for me too. I do long drives on the weekends also just not 4hrs worth.

MikeFig82

iTrader: (13)

I gutted the airbox charcoal filter + the Apexi throttle controller activated always. I'd say I average about 25 MPG HWY wise.

DMV350

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nosurprise

iTrader: (1)

I would think that you need to go at least 40mph because that's when the car shifts to 6th gear.

Brosillo

iTrader: (1)

I think that 70-75mph range has worked best for me. Went on a 3.5 hour trip across the state last year and tested mpg both ways. Got 30.1 on the way there and 29.8 on the way back. Just did a different trip more in the middle of nowhere and averaged closer to 80-85mph and I think my average was closer to 27mpg. Not apples to apples though given this one was in colder temps and the other one was summer time.

2013FSport

iTrader: (2)

Pull up Torque and watch the vacuum. Cruise at different speeds finding the least amount of throttle opening giving the highest vacuum. It could be pretty close to the happy spot you seek.

On that note I did a 250 mi highway trip most of which was at or above 80 mph and averaged 23.5 mpg. That said it has gotten 26 keeping it under 70. Air drag becomes a huge factor as speeds go up.

Aspect

^ That's true but I thought it'd be interesting to see what other members are doing as well. Elevation change, temperature, wind, etc etc always change the values but engine sweet spots I imagine would be constant. I remember seeing this gadget you could install on your car that changes color depending on if you're in the most efficient engine ranges or so which kind of inspired the thread. General consensus so far is that 70-80 is best with low 70s possibly being better than high 70s to 80

DMV350

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XSV

iTrader: (1)

Are you paddle shifting? I've never noticed any gear lockout, but I drive mostly with auto.

DMV350

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XSV

iTrader: (1)

interesting. I'll take a look tomorrow morning.

2013FSport

iTrader: (2)

Yes it does (lock out 6th until warm). Anyone getting straight on the highway from cold start will notice.

You'll also notice TC lockup is locked out when cold.

Skewing even further O/T....
Ever notice the different coast profiles and/or deceleration profiles?
Example is highway speed deceleration profile is very different between between 6th And 5th, 5th and 4th as far as the fuel cut map above 2200rpm while in lock up.

And when 2nd or 3rd is selected that jerky on off on when on the bubble of <> 2,200 RPM where it goes in and out of fuel cut coasting in lockup, and idle coasting out of lockup... I'm just saying it's painful to float on the bubble of fuel cut to keep from using the brakes mile after mile in heavy traffic.
If I get the ECU flashed I want the Fuel Cutoff raised or eliminated.

metaleckz

iTrader: (9)

petersu33