Re: tank volumeweights (VW)
The volumeweight in a full tank will change along with fluctuating temperatures, so i find it important to closely guesstimate the ranges in weight that a full tank will vary. A heavier tankfull gives the engine more fuelweight to gobble up, even though the gallon capacity was topped up the same.
90degF - 1.47 lbs-per-litre X 48litres = 71lbs X 11km/lb = 791km
0degF - 1.59 lbs-per-litre X 48litres = 76.32 lbs X 11km/lb = 839.52km
You'll go 48.5km further if the fuel tank starts off full at the fuel temperature of zero Celsius because there the heavier volumeweight contains more fuel for the engine than if the fuel tank was full with 90degree fuel at the beginning of your trip. The engine only knows pounds, but my pocketbook only knows the dollars that the litres cost me.
Last edited by pdw : 07-07-2008 at 09:49 PM.