Thread: Diesel + lpg = big mpg View Single Post
 09-26-2012, 09:33 PM #4 (permalink) Diesel_Dave Master EcoModder     Join Date: May 2011 Location: Indiana Posts: 1,194 White Whale - '07 Dodge Ram 2500 ST Quad Cab 2wd, short bed Team Cummins 90 day: 37.68 mpg (US) Thanks: 112 Thanked 502 Times in 211 Posts Yes, assuming your goal is economical, then you need to compare cost improvement (cents/mile). This will include the cost of diesel + the cost of the LPG. If you wish you could calculate an "equivalent fuel economy" on a cost basis like this: MPG_equiv=M/(Gd+C*Gl) where M = miles travelled Gd=gallons of diesel used C= cost ratio of LPG to diesel, e.g. (price of LNG per gallon/price of diesel per gallon) Gl=gallons of LNG used That way if the cost per gal for LNG is half that of diesel it "counts" as half a gallon of diesel. If you objective is technical equivalence, then you'll have to do something similar with energy content instead of price. If your objective is carbon dioxide related that you can weight it by the carbon content. __________________ Diesel Dave My version of energy storage is called "momentum". My version of regenerative braking is called "bump starting". 1 Year Avg (Every Mile Traveled) = 47.8 mpg BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg): http://ecomodder.com/forum/showthrea...5-a-26259.html
 The Following User Says Thank You to Diesel_Dave For This Useful Post: TDFbound (11-22-2018)