the chang

I have no idea on the validity of this. My friend just forwarded it to me and I thought it seemed fairly reasonable.

However, even if it's not...it might lessen the pain of always buying all that gas

...Serenity Now, serenity now......

sixcard

I doubt if the temp of several thousand gallons in an underground tank is in phase with the outdoor ambient temp. I doubt if so much underground fuel changes enough to even measure.

Sounds like "old wives" advise to me.

And I do stomp on it now and then to eat up any such advantage.

info@trinityautosport

interesting tips. thanks for sharing

hondik

Interesting info.. However 90% of the time I tank when having only last miles to go. I liked the dry ice trick though!! Will try

iversonm

Yes. What vapor is produced will be captured in the charcoal canister and burnt in the engine. Your fuel system is airtight to a ludicrous level. The fuel tanks are subjected ta a helium sniff test at manufacture. The tank is filled with helium, and detectors on the outside will try to detect a leak. The spec is tight enough that stray helium naturally occurring in the atmosphere will set it off, so the outside of the tank is filled with pure nitrogen before the test.

You can actually make the statement that a modern car produces less pollution running than a car from the 70's does parked with the engine off.

The part about the vapor recovery system is correct, except that only some states require vapor recovery systems, mostly in states with big air pollution problems. Large parts of the midwest do not have these systems.

As for ground temperature, it should not vary at all during the day. Around here, the ground temperature is around 50 degrees year round, once you get deeper than about 4 feet. That's the entire principle that makes geothermal heat pumps so efficient.

EBMCS03

Sounds like CA emissions to me...

baadaaboo

shall we send this to mythbusters to have them test it?

UUronL

Yeah, I had been mulling this over... it occured to me that when I had kept a spreadsheet (more than a year with the E60), I certainly didn't see any significant variation in gas consumption that could be correlated to anything -but- tire pressure. I certainly didn't see anything that would suggest that temperature or seasonal variables were impacting mpg.

While I don't doubt that when you're talking about millions of gallons the environmental variables are critical, for the small amounts that the individual pumps, it would likely be unnoticeable. It should be easy enough to calculate though.

My own mileage calculations only suggested that tire inflation could seriously affect observed mileage. Keep them inflated if you want to see optimal results. The difference between "full" load pressures and partial loading was a good 2mpg.

baadaaboo

does it use more gas to hull a full load tank of gas?