In Sonyota supposedly gas is about $1.00 (3 pesos per liter) less per gallon than in RP,
(I haven't tried to do that yet). Someone could verify this I am sure.
Also, be sure to totally stop and wait for 3 seconds at all stop signs and stay under 27mph (40kph) through town.
There are a few police trucks making a nice living by pulling over USA plated cars and saying they were speeding or didn't spot at an Alto sign.
They want $40-100 to let you pay them.
Especially at the border side of town and the southern end of Sonyota.