Let's for argument sake not look at the 2 extremes (highway and towing) of a truck's mpg as neither happens very often for most of us. A better analysis looks at average mpg with mixed driving since that is what we do in reality. I went to fuelly.com and got average mpg of both the Hemi (15.4mpg) and ecodiesel (22.5mpg). Then I applied this over 100,000 miles. Now you may keep your truck longer or shorter, but most of us starting itching for a new one around 100,000 miles. If you do this math, over 100,000 miles, at today's fuel prices the diesel saves you $3072.15 in fuel costs. Again I'm not considering maintenance, def fluid, resale, speculations regarding the worlds gas supply, your own personal satisfaction of driving, nor your need for costly blood pressure medicine while waiting on the ONLY diesel pump while some ass clown goes into the store for 20 minutes and leaves his 1986 Honda Civic parked in your way
(been there, done that), in this math. And in case you are curious you have to get to 163,000 miles before you breakeven on the $5000 diesel motor upgrade. Hard to ignore the $5000 when truck buying. I post all this to perhaps show people that maybe are not as "analysis inclined" as me to sit down and do the math.
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But I will say this: if driving the diesel makes you happy then go for it. It's just money. Can't take it with you. And we have to remember we are on a boating forum. If we only made sound financial decisions, then none of us would be here.