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  #13  
Old 05-20-2016, 05:16 PM
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Originally Posted by JGC_Larry View Post
Are we all in agreement that the in-dash MPG calculator is fairly accurate?
Its actually very acturate. Someone in another thread pointed out that if you do your manual calculation for 5 or 6 tanks vs just one it shows much closer. I tried what he said and it was within like .2 which its hard to do much better than that. I had never tried it that way before but he was right

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Old 05-20-2016, 06:15 PM
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Re: Impressed with MPG, but speed is huge factor

I always like to reset mine at each fillup and it's typically 1mpg off and reads better than you're actually getting.
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Old 05-20-2016, 07:43 PM
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Re: Impressed with MPG, but speed is huge factor

I've got the formula around here somewhere. Essentially the power required to increase your speed is exponential. I'm using fake numbers but to go from 55 mph to 60 requires 5 more hp. 60 to 65 is 10 more hp. 65 to 70 requires 18 more.
That's why most land speed machines have more money in Aero and friction reduction than engine power.
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Old 05-25-2016, 11:49 AM
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Re: Impressed with MPG, but speed is huge factor

read a few years back that (ballpark), 10kmh increase in speed was 15% more fuel.

The physics tell us that drag increases at the square of speed increase, 10% more speed takes 20% more fuel (you can get efficiencies in gearing or engine design to affect this a little).
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Old 05-25-2016, 12:58 PM
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Re: Impressed with MPG, but speed is huge factor

When I drive down to Austin (about 3 hours) I usually set my cruise to 75 and can have a range of my mpg from 23-26mpg. Depends on a few different factors.

However I had the opportunity to take Americas fastest highway back from San Antonio. The speed limit is 85mph. My cruise was set to 90 and I was averaging 16mpg.
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Old 05-25-2016, 03:19 PM
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Re: Impressed with MPG, but speed is huge factor

I just got home from a 400 mile round trip to Fairfax VA. 21.5 mpg at a constant 65 mph for all but the first and last few miles. The nice warm temperature outside didn't hurt, I'm sure.
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