Take a close look at the gearing on your gravel bike in gear inches with the slicks vs. your optimum gear inches on a road bike with 700 X 25. Note the differences and swap out the (likely) middle cogs to get the same cadence/mph ratio as the road bike.
Bet it will seem like less work.
I make all my own custom cassettes using loose cogs and spacers so that all of my bikes (road, gravel, touring), regardless of crankset combo & rim/tire size, have pretty much the same gear inches in the combinations I use the most. Careful record keeping of all rides over years and years of doing this shows that my speed/elapsed time for the same course is very similar on all of them. Yes, some have larger/more big cogs to be used for climbing rides, but MOST of my riding is done in the middle five cogs & that’s where most of the cog swapping occurs, even on the ones with larger tires.
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