Just tell me this, why would you drive all the way to engen or pnp to get a voucher to topup your internet?
I visit Engen on a regular basis either for petrol or Bimbo's take-away.
As the crow flies they are both within 600m from me. Drive wise it's about 1km.
This also saves me having to give the ISP my details which they want for some odd reason when you go online.