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Additive answers?
The OptiLube XPD that Night Sailor endorsed is about 90% naptha and trimethylbenzene. On Amazon, paint-thinning Naptha is $11/quart ($44/gallon) and Opti-Lube XPD is $14/quart, so just a 27% premium for the 10% of trace ingredients. (Plus pricey shipping) Trimethylbenzene is nasty stuff that's hard to buy, so it sounds worth a try from a local retailer rather than just pouring in a can o solvent, and even a 5% increase in fuel economy would be worthwhile for something that adds 11 cents per gallon (2.75%) to $4 diesel.
http://opti-lube.com/downloads/MSDS/...I_XPD_MSDS.pdf
A 5% fuel economy improvement on $4 diesel would breakeven at $25.60 per quart of additive, if used to treat 128 gallons, as claimed. Pennies, but worthwhile especially if the other benefits of fuel system cleaning and lubricity are realized...
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2012 Mitsubishi i-MiEV, 112 MPGe
2000 Honda Odyssey
1987 F250 Diesel, 6.9L IDI, goes on anything greasy
1983 Grumman Kurbwatt, 170 kW "Gone Postal" twin
1983 Mazda RX-7 electric, 48 kW car show cruiser
1971 VW Karmann Ghia electric, 300 kW tire-smoker
1965 VW Karmann Ghia cabriolet, 1600cc
Have driven over 100,000 all-electric miles!
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