Allow for more, hope for the best.
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I'm reading that on average $1.7 per gallon?
I think it would be hard to find it at that price on average, especially in California and during the summer season, but it will still be mega cheap compared to our UK prices ! I think we averaged about $3 per gallon on last years trip and I would budget for that again, although you could enjoy even cheaper, perhaps somewhere in the middle, [$2.5] but I'm no expert !
Be prepared to be amazed !
I'm not even sure what, if any, paid activities are available in these parks, but you will have plenty to keep you occupied with the incredible natural beauty in these parks, along with the visitor centres, and if you want to, there are sometimes Ranger led talks and activities.