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Yes
 

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For those that live in colder areas the fuels change to a winter blend that has lower energy density. So the winter fuel itself reduces mileage too.
 

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During summer I average 60 mpg on my daily commute. This morning it was 17 degrees and I just broke 50 mpg, so yes a 10 mpg loss is possible. I have tried the 6x17 radiator block and could honestly say I didn't notice any difference in mpg.
 

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MPG Issues

The temperatures in the region I live in have dropped to single digits at night and teens during the day. I can't bare the drop in mileage, even with the creative modifications. I am fortunate, as I have another car to drive until spring. I resolved myself to the sad fact that the Insight will sit until then ( with occasional scheduled engine turnover). The thought of reducing my lifetime mileage during cold weather driving is what motivates me to this decision.
 

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Some people run a hot air intake off of the cat to help keep the temp up on the intake side. I haven't tried that, but I do use the radiator blocker.
 

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Re: MPG Issues

Rober said:
The thought of reducing my lifetime mileage during cold weather driving is what motivates me to this decision.
LMAO, so you are going to drive something that gets worse gas milage than the Insight, even in the cold, and produces more green house emissions, just to not lower your LTM? Doesn't that defeat the whole purpose of having the insight? Or did you just get it for LTM braging rights? ROFLMAO
 

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Re: MPG Issues

[mod edit: Removed entire quote in immediate reply. See rule #12]

Dice, If I assume Rober's other car he will be driving during winter is his 95 Honda VX with a LMPG of 55 mpg, he is still using less gas and emitting less emissions than 99.9% of the other cars on the road. It is his choice to make. I could also drive my second vehicle, a Toyata 4Runner 4WD that gets 17 mpg during the winter to "save" my Insight's LMPG, but I choose to drive my Insight except during heavy snowfalls. I really don't see the humor in Rober driving another very fuel efficient car when he so chooses.
 

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MPG Issues

Thanks for pointing out that my second car is an aging MT Honda Civic VX that I have maintained and kept on the road. Kind of a knee jerk reflex by the previous poster. His points are well taken though. Rober
 

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man

LMPG 71.2, and climbing!?!?!?!?!?!!?

man mine is 50.2 at 97k miles....
course when I bought it it was 43 so not too bad i'd say.....
 

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Have had my 2006 Insight for over 1 year now. My milage drops in the winter also, but I'll get it back up in the summer. Now hovering at 64.6 LMPG at about 23000 miles.
 

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Re: MPG Issues

Rober wrote: The temperatures in the region I live in have dropped to single digits at night and teens during the day.
I hear you. It's ten below outside right now. I don't care so much about my LMPG, but I do care about my fingers freezing on the commute to work. I don't intend to drive a car in a Minnesota winter without a decent heater. So the old Escort is back on the road until it hits 20 degrees above. In this cold, it's about 10-15 mpg lower than the Insight, but it warms up within 2 miles, not 12.

I love the Insight, but it really is not a car for all seasons. In summer, it beats anything else.
 

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LJF, do you use a radiator blocker?

The reason I ask is that my Insight became nice and toasty warm after just a few miles (certainly not 12) driving home in our -10 degree Minnesotan weather today. I have noticed a big difference in warm up times between blocking the radiator and not doing so.
 

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Hi LJF and welcome to the forums :!: :)

12 miles :!: :shock: I'd suspect a stuck open thermostat.

Kevin:

In the minus F range I'd be tempted to further experiment with the cardboard block too. It's likely a 3/4 coverage would be of benefit.

The usual cautions and ability to monitor live ECT readings also becomes more critcal.
 

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WINTER WEATHER ALWAYS LOWERS MPG

Its all a matter of physics as your tires have to push through slush, snow, denser air, reformulated gas, and maybe you want the car to warm up a little before driving. Also the transmission, wheel bearings will provide more drag because of being colder too! How much harder is it for you to walk through snow? :shock:
 
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