[Vwdiesel] Jet A

[Justin Bennett]

Going to pass on some info concerning Jet A in TDIs.  Have ran about 25 gallons mixed in various ratios thru my 98 Jetta.  Two things I noticed was that there was a noticeable decrease in fuel economy and a change in the way it started.  It wasn't as rattly on start and didn't seem to start as quickly.  Since I was fueling out of 5 gallon jugs I do not have a hard number on what the decrease was.  It was like running super winter blend fuel.  Here is the specific gravity numbers from the back of the Biobore JF jug.

JP4     6.363 lbs/gal
Jet A   6.714lbs/gal
#1 D    6.827lbs/gal
#2 D    7.060lbs/gal

On certain turbine engines there is an adjustment for specific gravity so if you were running a different weight of fuel you could change fuel scheduling to make it run better.  Wonder if there is a way to do that on the TDI engines.
Justin