I'm a current fan of Roadtrippers dot com. Not sure it does a diesel location guide as I always use my phone for that using any of the numerous fuel apps available.
Anyway, it's pretty good. And since I won't be traveling much this year due to prices, it's low yearly cost fits my current budget. Many of the other trip planners seem to be biased to sell you stuff rather than help you plan a trip. Everyone seems to have their hands out looking to take your money. Roadtrippers is rather delicate in that respect.
Just checked, it does have a fuel feature for along your route. That's handy. And all sorts of other filters and suggestions, like campgrounds.
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