โNov-15-2019 05:33 PM
โNov-23-2019 01:50 PM
โNov-22-2019 07:22 AM
wopachop wrote:
4. Fuel truck guy accidentally put the high octane into the low octane bladder.
โNov-21-2019 04:52 PM
โNov-21-2019 01:06 PM
drsteve wrote:
I'd say gather some more data before drawing any firm conclusions.
โNov-21-2019 07:21 AM
pianotuna wrote:
Phil,
It is NOT 20% improvement. I regularly got 9 mpg. Now I'm getting between 10 and 11 *if* I drive 49 mph. (not lie-o-meter, real measurements)
I do have air tabs--but never noted any difference in mileage, except with a tail wind--where they lowered fuel consumption a bit (measured by a lie-o-meter). They helped with cross winds--and large trucks. They helped with noise levels in the cab.
However today I was for some time driving 75 mph. The lie-o-meter was reading about 5.2. At 70 that was 5.8 and at 65 6.4. about 1/2 the trip was at 65 mph.
There was a head wind but not much of one.
I drove 585 miles and consumed 77 US gallons. That works out to 7.59 mpg. My RV weighs 13750 lbs.
โNov-21-2019 04:42 AM
โNov-20-2019 09:15 PM
โNov-20-2019 03:42 PM
JaxDad wrote:
On he contrary, any improvement in the aerodynamics of a โbrickโ result in pretty substantial gains. Bear in mind also that as speed increases the drag does NOT increase proportional to the gain. According to Bernoulli's equation, drag is proportional to the SQUARE of THE speed.
Look up โAirTabsโ and the gains that can be made by just adding some little plastic stick on tabs to a โbrickโ and changing the vortices that form BEHIND it.
โNov-20-2019 11:36 AM
โNov-20-2019 09:55 AM
โNov-20-2019 07:19 AM
pianotuna wrote:
The wheels had been aligned less than 1000 miles ago.
โNov-20-2019 04:02 AM
philh wrote:JaxDad wrote:
As a pilot with a degree in aerospace engineering I can tell you that โparasitic lossesโ can manifest themselves in many weird and wonderful ways. Likewise the gains created by eliminating them, witness the little air tabs (originally designed for aircraft) that can measurably increase fuel mileage on a coach.
In this case, Iโd say an overloaded suspension created excessive (even if you werenโt aware of it, the slow creep is imperceptible) motion which created the losses youโre now recouping.
At Motorcoach speeds, parasitic losses on a brick aren't going to amount to much. OP said 1.5 to 2 mpg improvement. There was either something very seriously wrong with the alignment or the OP's calculations are a bit off.
โNov-19-2019 04:19 PM
โNov-19-2019 08:29 AM