Originally Posted by Rugged Brown
Calculating gas mileage manually is less accurate than with the trip computer. Typically , after the gas pumps shuts off, you can still stuff an extra couple of gallons in the tank. How do you really know how much gas is in the tank.
Wow, that was a big statement.. Now the feedback.
I don't buy it. We've checked the math too many times over way
too many fill ups. Some vehicles might not vent the tank correctly and
they might have trouble filling the tank.
My tank fills.
If I click the nozzle more than once to top up it runs out the filler neck.
That is as full as you can get.
I know our "trip computer" is not that accurate.
Sure, you might be right on one fill up vs the computer.
I've gone 4000 miles and kept track of every single gallon of gas we
bought and done the math over the entire trip.
That trip I mentioned earlier with the diesel was figured over the entire
round trip which included at least a dozen fill ups.
I got what I got.
10.5 with the diesel.
9.5 with my gasser.
Both over long distances pulling the same trailer. I typically drive ~ 67 mph-
when interstate condition and traffic will allow.
If I slowed to 60 those numbers would un-doubtedly go up.