mileage goes up with age??? you bet it does.
#1
02-07-2008, 11:54 PM
mileage goes up with age??? you bet it does.
I used to be happy to get 17 mpg... I had to drive like a real old man just to get 17's... now 60000 miles later 17's are no problem, 18's if I try. Just got done running 583ish miles with the tst set on 5/5 & rail pressure on 2 and I was not kind to it... end result was 17.1 mpg [sm=icon_rock.gif]
#2
02-08-2008, 06:27 AM
RE: mileage goes up with age??? you bet it does.
Don't give all the credit to the engine.
As the tires wear and get old
the tread depth becomes shallow
and this improves rolling resistance and improves MPG.
Inside the engine
the improvement comes mainly from the piston rings wearing and relaxing
which decreases friction...it is not that anything becomes 'smoother'
There is also an effect where hard deposits on the piston tops and combustion chamber raise the compression ratio and insulate against heat loss like an expensive ceramic coating.
As the tires wear and get old
the tread depth becomes shallow
and this improves rolling resistance and improves MPG.
Inside the engine
the improvement comes mainly from the piston rings wearing and relaxing
which decreases friction...it is not that anything becomes 'smoother'
There is also an effect where hard deposits on the piston tops and combustion chamber raise the compression ratio and insulate against heat loss like an expensive ceramic coating.
#3
02-08-2008, 08:44 AM
RE: mileage goes up with age??? you bet it does.
ORIGINAL: HankL
Don't give all the credit to the engine.
As the tires wear and get old
the tread depth becomes shallow
and this improves rolling resistance and improves MPG.
Inside the engine
the improvement comes mainly from the piston rings wearing and relaxing
which decreases friction...it is not that anything becomes 'smoother'
There is also an effect where hard deposits on the piston tops and combustion chamber raise the compression ratio and insulate against heat loss like an expensive ceramic coating.
Don't give all the credit to the engine.
As the tires wear and get old
the tread depth becomes shallow
and this improves rolling resistance and improves MPG.
Inside the engine
the improvement comes mainly from the piston rings wearing and relaxing
which decreases friction...it is not that anything becomes 'smoother'
There is also an effect where hard deposits on the piston tops and combustion chamber raise the compression ratio and insulate against heat loss like an expensive ceramic coating.
Well the tire gain will be apparent here pretty quick, another couple of months (if even that) and I'll have the other set on. (near new, same tire... set sitting in the garage)