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summer I get 21-22, winter I am getting spot on 20 each tank.
Partialy colder air, and partialy the winter blend of gas in some areas. Also factor in that (at least in my case) there is a longer warm up time for the motor. |
The two things that I would add, solely because the gas issue has been fully explored and winter gas does have all the faults above referenced, there is a longer time spent on choke in winter which will lower your mileage. Choke in a renesis sucks down alot of gas, and be sure to check your tire pressure. I find that I have to check my tire pressure a couple times from fall into winter to make sure that I am at pressure. Even if the light isn't on, you could be a little low and even a little low can effect gas mileage. That's all that I could think of. Have a good one!
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Ok, my take on this. Yes, the oxygenated fuel thing, and if you've tried putting your hand on one of the oil coolers after even a long trip when temps are below freezing, you'll probably find it isn't very warm. I believe the oil circulation is thermostatically controlled, but even so, there must be some frictional loss due to cold, more viscous oil.
I think the engine just doesn't warm up to efficient operating temperatures with all that cool oil either. |
Originally Posted by dmp
Good lord! I have no idea what's wrong with ya - or right, actually...but 280 miles per tank??? Holy shit. Once...just ONCE my car got 250 miles on a tank...took 12 gallons to fill.
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We have already discussed two related changes in gasoline composition which decrease fuel economy: adding oxygenate and adjusting the octane of oxygenated gasoline. Adjusting gasoline volatility for seasonal ambient temperatures also requires changes in gasoline composition. Summer gasoline is given a lower volatility to avoid vapor lock and minimize evaporative losses. Winter gasoline (both conventional and oxygenated) is given a higher volatility to facilitate starting and warmup. The compositional changes required for the shift from summer gasoline to winter gasoline decrease the gasoline's energy content. Depending on the magnitude of the volatility change, the fuel economy of winter gasoline will be 0.5% to 1.5% lower than of summer gasoline. |
Originally Posted by Brice-RX8
But boy, does the car just love this cold air, makes it feel much stronger.
I've also observed better gas mileage in the winter...during the summer I would get in the low 14 MPGs, nowdays I'm getting around 15.5 MPG or so. |
my gas mileage sucks no matter what
I have just accepted it |
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