bjbear wrote:
JRscooby wrote:
My '95 3406 drank.... The temp of fuel going in the tank had much more effect on MPG than percent of bio.....
Can you explain a little more about you comment about fuel temperature affecting MPG?
We buy fuel measured in gallons, with is volume. Most liquids, get more dense as they cool. Fill the tank up to brim on a hot day, leave it set, and pretty soon the tank is overflowing. If a station was to buy 10,000 gallons of fuel that was 60* when it was put in the delivery tanker, then let it warm up to 80*, sell 10,000 gallons, they would still have fuel in the tank. There is less energy in a given volume of fuel, if the fuel is 80* instead of 60*.
Very few RVs will burn enough fuel for it to be a issue, but this has been a issue for trucking industry for a long time. The large fleets, that buy most of their fuel by the tanker load, get to use the growth in tank. When I was working if the nozzle did not feel cold after I had pumped a few gallons, I would mark my truckstop book not to fuel there.