This thread has kicked around for some years and I've not gone back and reread all the posts so what follows may be simply rehashing previous info:

For those using an MSR Whisperlite (reliable, field serviceable, rugged, powerful, loud, cheap to operate, and despite camping lore capable of simmering) they do make a replaceable fuel jet - which is a tiny lightweight part - made specifically for use with standard automobile gasoline not white gas. The In fact a variant model called the 'MSR Whisperlite International' includes the auxiliary jet to permit it to burn white gas, kerosene, and unleaded auto fuel.

When I am doing long term camping at an area (aka a 'dig in') I typically buy a gallon of white gas. However, when moving about I use gasoline purchased at the gas station pump because it's available anywhere there's cars so it's ubiquitous and cheap. The only tradeoff is that it burns dirtier than white gas so pot bottoms may get more soot and one will likely need to clean the jet orifice more often (but with the modern 'shaker jet' version of the Whisperlite this task is easy and involves simply shaking the stove before firing it up each time). Despite the advent and convenience of the shaker jet technology I highly advise owning and bringing the auxiliary jet cleaning tool (which weights next to nothing) esp. when using standard auto fuel. Other than incorrect fuel bottle pressurization, a dirty or obstructed jet is the most likely cause of poor performance for this stove. It's also a good idea to carry a few small 'O' rings for the pump (either from an MSR maintenance/rebuild kit or from a good camping store's tackle box of spare parts kept behind the counter) as well as the little lightweight stamped metal field tool which permits one to break down the stove in the field. Also, a few drops of oil on the pump's plunger cup if/when needed. Armed in such a manner this stove will serve a lifetime.

If you're comfortable with the weight, performance, and cost of this stove + bottle system it can be operated very cheaply with standard gasoline that's always available (even without gas stations you can siphon it from a car). If price is a concern I wouldn't hesitate to buy a used one as they are durable and even if beat up they can perform well and they have been produced in huge quantities (disassemble & clean it, by soaking the jets metal parts, replace any worn out 'O' rings, bend the wire legs if thy've been distorted). MSR also has a very solid track record for warranty and repair.

*Note on buying used:
The shaker jet is a conveinance worth having. Be aware that first generation models have a rubber fuel line covered in a reddish woven cloth, newer versions have a metal braided covered fuel line. I've owned this stove 30 years (two models) and have accumulated 2-3+ years worth of continuous usage time. 20+ years ago my very old original from the 1980s needed a repair and I sent it in to MSR however they refused to return it due to it having an outdated 'hazardous' cloth fuel line covering thus generously offered to replace it with a new and improved shaker jet/metal braided fuel line model.