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Old 08-14-2014, 07:21 AM   #1 (permalink)
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Had a great example of how rain can affect MPG. A trip from Maine down to Massachusetts yesterday, new full tank, good roads, freeway some attention paid to mileage, arrived at destination with 68 mpg including lots of 70mph, 120 miles covered. The return was mostly in a driving rainstorm, the one that dropped 13 inches on LI. Tank now reads 59.6, same road, mostly running 55 mpg or slower. Much of the time spent under 50 mpg.
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Old 08-15-2014, 10:59 AM   #2 (permalink)
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Wouldn't driving slower give you better MPG's? Was there more stop-n-go traffic in the rain? Did you have heat and/or defrost on?
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Old 08-15-2014, 11:12 AM   #3 (permalink)
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I too notice a pretty substantial hit when driving in the rain. Guess the "air" is a lot harder to push out of the way when it becomes "the sea."
Add in the resistance on the tires of water on the road...

Want to see the biggest hit? A warm rain that eventually requires you to run the defogger... Ouch. It can be near impossible to hit 50 MPG for that highway trip.
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Old 08-15-2014, 07:21 PM   #4 (permalink)
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i drove lat weekend from DC to home in NC and got 66mpg and this was calculated at the fill-up. On the way back, hit rain most of the time and was unable to get into lean burn much if at all and used much more battery along the way. Felt the drag from the rain. Got 58 on the road back with the same driving habit and only one stop along the way.

Price of having the cool car! way better than my S420 at 21 mph on premium...RLTW
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Old 08-15-2014, 09:32 PM   #5 (permalink)
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Quote:
Originally Posted by Insightlover2011 View Post
Wouldn't driving slower give you better MPG's? Was there more stop-n-go traffic in the rain? Did you have heat and/or defrost on?
Driving slower would help if it wasn't for the rain. Traffic was moving smoothly just down around 50-55 instead of 65-70 due to visibility and fear of hydroplaning. Heat and defrost were off. Just a drag and traction issue.
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Mileage: 65mpg on 80 mile commute summer, 55 in winter with studded snows.
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Old 08-15-2014, 09:55 PM   #6 (permalink)
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Never thought of drag from rain being an issue, or heavier "air". But I guess it makes sense.
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Old 09-02-2014, 02:25 PM   #7 (permalink)
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Indicated 120+ MPG for 40 miles at 80+ mph behind this sailboat... Drafting is more important than anything else that can be done. <-- that's a period.

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Old 09-02-2014, 02:58 PM   #8 (permalink)
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Most of the time you are drafting you are also driving slowly.
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Old 09-02-2014, 05:40 PM   #9 (permalink)
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Quote:
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Most of the time you are drafting you are also driving slowly.
I draft in Chicago pre-rush-hour traffic 80 miles a day most of the time well over 65 mph.

Porsche Cayennes are good for a draft up to 105 mph at 80 mpg. I like big buts and I can not lie!!!
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Old 09-02-2014, 11:06 PM   #10 (permalink)
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Quote:
Originally Posted by seabag View Post
Had a great example of how rain can affect MPG. A trip from Maine down to Massachusetts yesterday, new full tank, good roads, freeway some attention paid to mileage, arrived at destination with 68 mpg including lots of 70mph, 120 miles covered. The return was mostly in a driving rainstorm, the one that dropped 13 inches on LI. Tank now reads 59.6, same road, mostly running 55 mpg or slower. Much of the time spent under 50 mpg.
I too notice a significant reduction in MPG when the road is drenched. I think I've notice two factors. It requires some considerable energy to push water aside in front of the tires. You will nice this effect when you run through a deep puddle. The car will actually pull to one side or another. Second, raising literally hundreds of gallons of water to 10' or so is a tremendous amount of pumping. This is another big loss of energy.
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