It's been years since I've taken that route and back then it was faster to just cross at Lukeville and hit I8 for the rest of the trip.
A few other things you should consider before making your decision.
1. You will be right on the border most of the way so look out for people trying to get into the US, including smugglers.
2. The route has very few gas stations so keep your tank above 1/2.
3. The majority of traffic will be 18 wheelers, and with few (if any) traffic cops they will be highballing!
4. The road condition wasn't the greatest back then. If you remember Mex-2 between Sonoyta and Santa Ana before all the work, then you've got a pretty good idea of what is was like.
5 Make sure you can complete that leg in one day. You don't want to be boondocking out there!
Turtle & Toad, On the Road
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Gas up in Sonoyta and you'll be fine. Lots of big rigs but the road is in good shape. Gasoline costs a dollar and a half less in Mexico and that's a good reason to enjoy Mex 2! Too much military and SSP around to allow the bad guys a fair chance at the chickens :-) But, that all changes once the sun goes down. Hunker down in a good overnight hideout.
We drove from the Baja to Lukeville via Hwy 2 a few years ago. They were rebuilding the highway east of Algadones for many miles. Should still be in good shape. We stayed several days in Algadones at a very nice RV Park which was gated. It was interesting being on the Mexican side when everything shuts down in Algadones after the tourists go back to AZ/CA. Crossing at Mexicali was OK, but like most, it is a bit tight, so watch out for posts, etc. We had a 37' 5W. Fuel was a lot cheaper and not a problem. Great place for RXs, dentists and drs.
'06 Chev D/A--'08 Cardinal 35 SB
Fulltiming since 8/93
Go noth to Sonoyta, continue nort the border, cross at Luckeville, continue on 85 to Ajo and Gila Bend, at Gila, you will see the 8 freeway, follow sign to San Diego, you will go trough the follwing towns, Yuma, El Centro, then you will reach a place caled Ocotillo, a long up-hill grade starts, down shift and take it easy it is long.
If there is a high wind advisory, stop at the Golden Acorn casino, and wait the wind out.
Keep on 8, when you reach El cajon, you are in the out-skirts of San Diego, this way you avoid, all the big rigs in Mexico.
Well the NEW HIWAY is a great drive and has nice views. It will save you time and a lot safer. Just gas up before you leave Penasco. Do not drive into el Gulfo as they just have sandy roads.
Thanks for the good advice everyone i think I will take highway 2 one more question how do i return my tourist visa card and get my passport stamped do I have to back track to the the 21km post out of Sonoyta? Thanks Les