One factor that comes into the mix is that colder air is more dense & so needs more Gas to keep the FuelSupply Stoichi' ~ That DenserAir also produces a HarderWall to push @ HiwaySpeeds ~ it's the reverse of those things that helps those of us living @ higher alti's to get better gas milage than the folks @ SeaLevel. But WinterFuelMixes is probably the biggest factor. Also keep in mind that the vol' of a Gal'OfGasoline @ 80º is 233.7CuIn & @ 30º it is 227.0CuIn so you actually have less GasByVolume in your tank in the Winter than in the Summer but I haven't really thought through what effect that might have on the Air/GasRatio once that Gasoline gets Atomized by the Injectors. I also find that sometimes when the price of gas goes down that my MPGs go down as well. May be some FunnyBusiness going on there ~ ORR ~ DeanB
On 30 Nov , 2012, at 10:24 AM, Rocket J Squirrel wrote: > Well, as I mentioned my driving habits are no different now than they > are in summer, and I should have also said I don't have any ice or > snow > to deal with, at least not this early in the season. I get my gas at > Chevron and it's normally 10% ethanol year-round, but I'm going to > fill > the tank with 100% petrol next time, to see what diff it makes. > > -- > Jack "Rocket j Squirrel" Elliott > 1984 Westfalia, auto trans, > Bend, Ore. > > On 11/30/2012 09:21 AM, mcneely4@cox.net wrote: >> Mr. Squirrel, I find it to be true of all my vehicles. I believe >> that one reason has to do with the consequences of driving on ice and >> snow, which means more variable speed. I also believe that fuel >> formulation changes for different temperatures make a difference. >> The slight difference in fuel density should mean better winter >> mileage, but I guess the other factors obviate that. For my Prius, >> that vehicle runs the engine more to keep everything warmed to the >> temperature the vehicle's brain prefers. But that doesn't apply to >> the Vanagon of course. mcneely >> |
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