How to say Thank you

Perhaps a plant for his garden?

If he doesn't want payment for the petrol, maybe some grocery vouchers? Nice and generic. Or give him a can of petrol with a nice box of chocolates.

Yes grocery vouchers with a card with a thoughtful message sounds the ticket to me!

Just asked my DH, he said he would offer them the can and ask them to fill it and return it please.

Bottle of wine or plant.

As you don't know his tastes I'd go for a garden gift token. I'm sure he'd be pleased with that.

Definitely replace replace the petrol! Not sure what else though.

A bottle of wine - he can always regift it if he doesn’t drink

The can of petrol and a card

What a lovely kind man. I think a nice thank you card, a plant and replacement petrol.
Not wine, he might be a recovering alcoholic, not chocolates, he might be diabetic.
He was outside working in his garden so you know he enjoys that.

I would put the money for the petrol in a thank you card (petrol is costly). This is probably enough. Most kind folk just want to be appreciated with thanks............and possibly not be out of pocket.

You know how much petrol is. I’d give him that back + a little extra

Plus a thank you card.

Lovely to hear of people’s kindness.

LauraNorder

What a lovely kind man. I think a nice thank you card, a plant and replacement petrol.
Not wine, he might be a recovering alcoholic, not chocolates, he might be diabetic.
He was outside working in his garden so you know he enjoys that.

Giving certain things to people you don't know has to be carefully thought through, and not just to older folk.
Eg Plenty of people don't keep booze in the house
(Not that I speak from the experience of putting on Covid pounds!)
I'm with Laura

Great idea Rosie51.