hp comes at high rpms, uses more fuel and will overheat the engine if ran long term at this load.
torque is the power or force with no help of gears, occurs at low rpms and engines will run at almost the peak effiecintcy, lowest heat and lowest fuel.
it was thought that only hp could win races,, then audi ran the tdi diesel and won 3 years in a row,,the pugeot came along with thier diesel and beat audi's diesel with a newer better model.. but these are long races not 1/4 miles races..
so in a 1/4 mile the gas has the advantage... in anything longer under heavy loads, the diesel or higher torque vehicle will kick butt. Most diesels have the hp purposely limite in the injector pump by fuel limiting. On the older pumps, you simply turned them up and installed bigger injectors for more fuel and the diesels would go from 300 hp to up to a 1000 hp on the cummings 5.9s.. But other than short races or short pulling, they were not suitable for long duration work. diesel fuel has 25% more power that gas so it will always develop more power under the same given rpm than a gas engine. As discussed, You have to drive a diesel about 75000 miles to break even on the purchase costs. After that you come out ahead. If you pull a lot, you come out ahead sooner, much sooner and yes, you can pull bigger loads with out buring up the engine as you would on a gas engine.
Also remember that as you increase the rpms by 10%, wear increases 40%. Gas engines when pulling must use high rpms for hp.. diesels dont due to more torque. In heavy duty trucks, motorhomes, etc gas engines will wear out at 60 to 100K. The same gas engines with overdrive and keeping the rpms low will go as far as 150k to 200k on a regular basis. So if your pulling very much, then you have every reason to go diesel. If you pull once a year, and dont have to pull at 70mph and can take your time.. gas will do well. I see way too many city boys buying a diesel and never pulling a thing. I sure like these trucks when they trade them in.
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